import java.util.*;
import java.io.*;

class account{

 String jmeno;
 double balance;

 public account(String jmeno)
 {

  this.jmeno = jmeno;
  this.balance = 0;
  
 } 

 public account(String jmeno, double amountDeposit)
 {

  this.jmeno = jmeno; 
  this.balance = amountDeposit;

 }

 public void setJmeno(String jmeno)
 {
  this.jmeno = jmeno; 
 }

 public void setBalance(double balance)
 {
 this.balance = balance;
 }

 public String getJmeno()
 {
  return this.jmeno; 
 }

 public double getBalance()
 {
 return this.balance;
 }


 

}

class banking
{

		

	static ArrayList<account> accounts = new ArrayList<account>();

        public static account searchFor( String jmeno)
        {
 	
 	 for(int i=0 ; i < accounts.size(); i++ )
	 {
          account acc = accounts.get(i);
  	  if( jmeno.equals(acc.getJmeno())) return acc;
	 }	 
	
         return null;
  	}	

	
	public static void create(String jmeno, double amountDeposit)
 	{
        
                

        if( searchFor(jmeno) == null) 
	{
         accounts.add( new account(jmeno, amountDeposit));
	}	
	
	}
	 

 	public static void create(String jmeno)
 	{
        
                

        if( searchFor(jmeno) == null) 
	{
         accounts.add( new account(jmeno));
   	 System.out.println("create: ok");
	}
        else{
	System.out.println("create: already exists");
	} 	
	
	}

 	public static void deposit(String jmeno, double amountDeposit)
 	{
        
        account acc = searchFor(jmeno);
        
         if( acc != null)
	 { 
         acc.setBalance(acc.getBalance() +  amountDeposit);
	 System.out.println(String.format("deposit %.2f", new Double(amountDeposit)) +": ok");
 	 }
         else
	 {
	 System.out.println(String.format("deposit %.2f", new Double(amountDeposit)) +": no such account");	
	 }
	}
 
 	public static void withDraw(String jmeno, double amountWithdraw )
 	{

        account acc = searchFor(jmeno);
        
        if( acc != null)
	{ 
        double actualBalance;
        actualBalance = acc.getBalance();
          if(actualBalance < amountWithdraw)
	  {

	  System.out.println(String.format("withdraw %.2f", new Double(amountWithdraw)) +": insufficient funds");
 	  }
          else
	  {
	   actualBalance = actualBalance - amountWithdraw;
           acc.setBalance(actualBalance);
           System.out.println(String.format("withdraw %.2f", new Double(amountWithdraw)) +": ok");
 	  }
        }
        else
	{
	System.out.println(String.format("withdraw %.2f", new Double(amountWithdraw)) +": no such account");	
	}

 	}   
        
	public static void transfer(String sourceAccount, String targetAccount, double amount)	
	{

	 account sourceAcc = searchFor(sourceAccount);
         account targetAcc = searchFor(targetAccount);

	 if( sourceAcc == null || targetAcc == null){
         System.out.println(String.format("transfer %.2f", new Double(amount)) +": no such account");
	 }
	 else
         {
          
          if (sourceAcc.getJmeno().equals(targetAcc.getJmeno()) )
	  {
		System.out.println(String.format("transfer %.2f", new Double(amount)) +": same account");	   
          }
          else
          {
	   	double acb = sourceAcc.getBalance();
	        
		if(acb >= amount )
		{
		   
		  sourceAcc.setBalance(acb-amount);
                  targetAcc.setBalance(targetAcc.getBalance()+amount);
		  
		  int iSource = sourceAccount.lastIndexOf('/') ;
                  int iTarget = targetAccount.lastIndexOf('/') ;
                  
		  if( iSource > 0 && iTarget > 0 )
                  {
                     String strSource = sourceAccount.substring(iSource);
                     String strTarget = targetAccount.substring(iTarget);
                     if( strSource.equals(strTarget) )
                       System.out.println(String.format("transfer %.2f", new Double(amount)) + ": interbank");
		     else 
                       System.out.println(String.format("transfer %.2f", new Double(amount)) + ": ok");	
                  }
		}
		else
		{
		 System.out.println(String.format("transfer %.2f", new Double(amount)) +": insufficient funds");	   
		} 
 	  }
 	}
	}
	 

	public static void main(String arg[]) 
	{
	  
	   BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
       	   while( true )
 	   {
           try
	   {
 	   int n = Integer.parseInt(in.readLine());
           if( n == 0 )
           {
             System.out.println("goodbye");
             return;
           }
           
           for(int j = 0; j < n; ++j )
           { 
		
                ArrayList<String> commands = new ArrayList<String>();   
		StringTokenizer tokenizer = new StringTokenizer(in.readLine(), " \t");
                while( tokenizer.hasMoreTokens() )
                   commands.add(tokenizer.nextToken());
              
                int iCommandCount = commands.size();
               
		if( iCommandCount == 2 )
                {    String strLine = commands.get(0); 	
                     
                      create(strLine, Double.parseDouble(commands.get(1)));
		     
                     
                }
      } // for
   		 boolean bEnd = false;
                while( !bEnd )
                {
                ArrayList<String> commands = new ArrayList<String>();   
		StringTokenizer tokenizer = new StringTokenizer(in.readLine(), " \t");
                while( tokenizer.hasMoreTokens() )
                   commands.add(tokenizer.nextToken());
              
                int iCommandCount = commands.size();
                if( iCommandCount == 1 )
		{
                       	if( commands.get(0).equals("end") )
                        {  System.out.println("end\n");
                            bEnd = true;
                           
			}
                        

		}
                else 
  		{
  			      if( iCommandCount == 2 )
                              {
                                        String strLine = commands.get(0);
					if( strLine.equals("create") )
                     			{
                        			
						create(commands.get(1));	
                     			}
     				  
                       			
                     
                              }      	
			      if( iCommandCount == 3 )
                              {
                              	 String strCommand = commands.get(0);
                                 if( strCommand.equals("withdraw") )
                                     withDraw(commands.get(1), Double.parseDouble(commands.get(2)));
                                 
				 else if( strCommand.equals("deposit") )
				     deposit(commands.get(1), Double.parseDouble(commands.get(2)));
                       
                              }
                              else if( iCommandCount == 4 )
                              {
				  String strCommand = commands.get(0);
                                  if( strCommand.equals("transfer") )
                                      transfer(commands.get(1), commands.get(2),Double.parseDouble(commands.get(3))); 
                                  
                              } 

                  }
                        
             } // while(!bEnd)     
                                                  
            }       
            catch(Exception e)
            {
	    }    
             
          
          } // while(true)
                    
	
	}
}