#include <iostream>
#include <string>

using namespace std;

	int reg[10];
string fromIntToRoman(int n)
{
	string result="";
	
	if(n==0)
		return "O";
	
	// 1000
	int i=0;
	int m=n/1000;
	for( i=0;i<m;i++)
		result+="M";
	
	// 100
	n=n-m*1000;
	int c=n/100;
	if(c==5)
		result+="D";
	else if(c==4)
		result+="CD";
	else if(c==9)
		result+="CM";
	else
	{
		int cc=c;
		if(cc>5)
		{
			result+="D";
			cc-=5;
		}
		
		for(i=0;i<cc;i++)
			result+="C";
	}
	
	// 10
	n=n-c*100;
	int x=n/10;
	if(x==5)
		result+="L";
	else if(x==4)
		result+="XL";
	else if(x==9)
		result+="XC";
	else
	{
		int xx=x;
		if(xx>5)
		{
			result+="L";
			xx-=5;
		}
		for(i=0;i<xx;i++)
			result+="X";
	}
	
	// 1
	n=n-x*10;
	if(n==5)
		result+="V";
	else if(n==4)
		result+="IV";
	else if(n==9)
		result+="IX";
	else
	{
		if(n>5)
		{
			result+="V";
			n-=5;
		}
		for(i=0;i<n;i++)
			result+="I";
	}
			
	return result;
}

int fromRomanToInt(string op)
{
	if(op.length()==1 && op[0]>=48 && op[0]<=57)
	{
		int r=op[0]-48;
		if(reg[r]<0)
			return -1;
		return reg[r];
	}
	
	int i=0;
	int result=0;
	char temp;
	while(i<op.length())
	{
		switch(op[i])
		{
		case 'O':
			result+=0;
			break;
		case 'V':
			result+=5;
			break;
		case 'L':
			result+=50;
			break;
		case 'D':
			result+=500;
			break;
		case 'M':
			result+=1000;
			break;
		case 'I': // 1
			if(i+1<op.length())
			{
				temp=op[i+1];
				
				if(temp=='V')
				{
					result+=4;
					i++;
					break;
				}
				else if(temp=='X')
				{
					result+=9;
					i++;
					break;
				}
			}
			
			result+=1;
			break;
		case 'X': //10
			if(i+1<op.length())
			{
				temp=op[i+1];
				
				if(temp=='L')
				{
					result+=40;
					i++;
					break;
				}
				else if(temp=='C')
				{
					result+=90;
					i++;
					break;
				}
			}
			
			result+=10;
			break;
		case 'C': //100
			if(i+1<op.length())
			{
				temp=op[i+1];
				
				if(temp=='D')
				{
					result+=400;
					i++;
					break;
				}
				else if(temp=='M')
				{
					result+=900;
					i++;
					break;
				}
			}
			
			result+=100;
			break;
		}
		
		i++;
	}
	
	return result;
}

int main()
{
	string line="";

	for(int i=0;i<10;i++)
		reg[i]=-1;
	
	
	while(1)
	{
		cin>>line;
		if(line=="QUIT")
		{
			cout<<"Bye"<<endl;
			return 0;
		}
		
		if(line=="RESET")
		{
			cout<<"Ready"<<endl;
			for(int i=0;i<10;i++)
				reg[i]=-1;
			continue;
		}
		
		
			int aR=line[0]-48; // assign resiger
		
		
			int i=2;
			char op='+';
			int tempR=0;
			bool flag=false;
			
			while(i<line.length())
			{
				string soperand;
				while(i<line.length() && line[i]!='+' && line[i]!='-')
				{
					soperand.push_back(line[i]);
					i++;
				}
				
				
				int ioperand=fromRomanToInt(soperand);
				
				
				if(ioperand==-1)
				{
					cout<<"Error"<<endl;
					flag=true;
					break;
				}
				
				if(op=='+')
				{
					tempR+=ioperand;
				}
				else // -
				{
					tempR-=ioperand;
				}
				
				if(i<line.length())
					op=line[i];
				i++;
				
			}
			
			if(flag)
				continue;
			
			if(tempR<0 || tempR>=10000)
			{
				cout<<"Error"<<endl;
				continue;
			}
			
			// output //
			cout<<aR;
			cout<<"=";
			cout<<fromIntToRoman(tempR)<<endl;
			reg[aR]=tempR;
			
		
	}
	
	return 0;
	
}