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

public class cc
{
	public static void main(String[] args) throws IOException
	{
		String [] pis = new String[10];
		pis[1]="    +    |    |    +    |    |    +";
		pis[2]="+---+    |    |+---+|    |    +---+";
		pis[3]="+---+    |    |+---+    |    |+---+";
		pis[4]="+   +|   ||   |+---+    |    |    +";
		pis[5]="+---+|    |    +---+    |    |+---+";
		pis[6]="+---+|    |    +---+|   ||   |+---+";
		pis[7]="+---+    |    |    +    |    |    +";
		pis[8]="+---+|   ||   |+---+|   ||   |+---+";
		pis[9]="+---+|   ||   |+---+    |    |+---+";
		pis[0]="+---+|   ||   |+   +|   ||   |+---+";
		
		Scanner sc = new Scanner(System.in);
		String line;
		int[] znak = new int[4];
		String [] co = new String[4];	
		String [] fin = new String[4];
		try
		{
			do
			{ 
			/*
				line = sc.nextLine();	
				//System.out.println(line.substring(0,2));		
				if(line.substring(0,2)=="en") break;
				 znak[0] = new Integer(line.substring(0,1));
				znak[1] = new Integer(line.substring(1,2));
				znak[2] = new Integer(line.substring(3,4));
				znak[3] = new Integer(line.substring(4,5));
				//System.out.print(znak[0]+","+pis[1].substring(0,5)+"  ");
				*/
				fin[0]	="";
				fin[1]	="";
				fin[2]	="";
				fin[3]	="";
				co[0]	="";
				co[1]	="";
				co[2]	="";
				co[3]	="";	
				boolean done = false;			
				for(int i = 0; i<7;i++)
				{				
					line = sc.nextLine();
					co[0] += line.substring(0,5);
					//System.out.println(co[0]);
					co[1] += line.substring(7,12);
					co[2] += line.substring(17,22);
					co[3] += line.substring(24,29);															
				}
				//System.out.println(co[1]);
				for(int k = 3;k>=0;k--)
				{
					int[] v = new int[10];				
					for(int i =0;i<35;i++)
					{
						if(co[k].charAt(i) != ".".charAt(0))
						{
							for(int j=0;j<10;j++)
							{
								if(pis[j].charAt(i) != co[k].charAt(i))
								{
									v[j] = 1;
								}
							}
						}
					}
					for(int j=0;j<10;j++)
					{
						if(v[j] == 0)
						{
							fin[k] += String.valueOf(j);
						}
					}
				}
				int hook = -1;
				vetrnik: for(int i = 0; i< fin[0].length();i++)
				{
					for(int j=0;j<fin[1].length();j++)
					{
						if(Integer.parseInt(fin[0].substring(i,i+1)+fin[1].substring(j,j+1)) <= 23)
						{
							if(hook != -1)
							{
								System.out.println("ambiguous");
								done = true;
								break vetrnik;									
							}
							hook = Integer.parseInt(fin[0].substring(i,i+1)+fin[1].substring(j,j+1));					
							//System.out.println(hook);							
						}
					}			
				}

				
				int mhook = -1;
				if(!done)
				{
					vetrnik: for(int i = 0; i< fin[2].length();i++)
					{
						for(int j=0;j<fin[3].length();j++)
						{
							if(Integer.parseInt(fin[2].substring(i,i+1)+fin[3].substring(j,j+1)) <= 59)
							{
								if(mhook != -1)
								{
									System.out.println("ambiguous");
									done = true;
									break vetrnik;									
								}
								mhook = Integer.parseInt(fin[2].substring(i,i+1)+fin[3].substring(j,j+1));					
							}
						}			
					}				
				}	
				if(((mhook == -1)||(hook == -1))&&(!done))
				{
					System.out.println("ambiguous");
					done = true;				
				}				
								
				/*
				for(int j=0;j<4;j++)
				{
					System.out.print(fin[j]+",");
					if(fin[j].length() != 1)
					{
						System.out.println("ambiguous");
						done = true;
						break;
					}					
				}		
				*/
				if(!done)
				{
					if(hook < 10)
					{
						System.out.print("0"+hook);
					}
					else
					{
						System.out.print(hook);
					}
					System.out.print(":");
					if(mhook < 10)
					{
						System.out.println("0"+mhook);
					}
					else
					{
						System.out.println(mhook);
					}					
				}
				line = sc.nextLine();	
				line = sc.nextLine();					
			} while(1==1);			
		}
		catch(Exception e)
		{
			System.out.println("end");
		}
		//int pocet = Integer.parseInt(line);		
		
	}
}