#include <iostream>
#include <string>

using namespace std;

char line[10000]; //zpracovany radek vstupu
string out;
int registers [10]; //registry

void reset(){
	for(int i=0; i<10; i++) registers[i]=-1;
	cout << "Ready" << endl;
}

void error(){
	cout<<"Error"<<endl;
}

void processLine(){
	int i=0;
	
	if (line[0] == 'R') {
		reset();
		return;
	}
	int regDest=line[0]-'0';
	i+=2;
	cout<<"cilovy registr je " <<regDest << endl;
	
	int operand=0,tempVysledek=0;
	char znak,operace='+';
	while(line[i]!='\0'){ //vnejsi cykl cteni radky
	do{ //cteni elementu
		znak = line [i];
		if (znak>='0'&&znak<='9'){ //je to cislo
			cout << "operand je registr " << line[i] << endl;
			operand=registers[znak-'0'];
			//cout<<operand<<endl;
			if (operace=='+') tempVysledek+=operand;
			else tempVysledek-=operand;
			//cout<<tempVysledek<<endl;
		}
		else{
		switch (znak){
			case 'M': operand+=1000;break;
			case 'D': operand+=500;break;
			case 'C': {
				switch (line[i+1]){
					case 'D':operand+=400;i++; break;
					case 'M':operand+=900;i++; break;
					default:operand+=100;
					}
				};break;
			case 'L': operand+=50;break;
			case 'X': {
				switch (line[i+1]){
					case 'L':operand+=40;i++; break;
					case 'C':operand+=90;i++; break;
					default:operand+=10;
					}
				};break;
			case 'V': operand+=5;break;
			case 'I': {
				switch (line[i+1]){
					case 'V':operand+=4;i++; break;
					case 'X':operand+=9;i++; break;
					default:operand+=1;
					}
				};break;
			case 'O':break;
		} //end top case
		}
		i++; //increment na dalsi znak
		
	}while (line[i]!='+' || line[i]!='-' || line[i]!='\n'); //konec cteni elementu
	if (line[i]!='\n') operace=line[i++];
	
	cout << operand << endl;
	} //end while cteni radky
	
	if(tempVysledek<0||tempVysledek>10000) error();
	else registers[regDest]=tempVysledek;
	//cout<<endl;
}

int parseRim(int &i){
	//cout << i << endl;
	int operand=0;
	while(line[i]>='A' && line[i]<='Z'){
	//	cout << "switch " << endl;
		switch (line[i]){
			case 'M': operand+=1000;break;
			case 'D': operand+=500;break;
			case 'C': {
				switch (line[i+1]){
					case 'D':operand+=400;i++; break;
					case 'M':operand+=900;i++; break;
					default:operand+=100;
					}
				};break;
			case 'L': operand+=50;break;
			case 'X': {
				switch (line[i+1]){
					case 'L':operand+=40;i++; break;
					case 'C':operand+=90;i++; break;
					default:operand+=10;
					}
				};break;
			case 'V': operand+=5;break;
			case 'I': {
				switch (line[i+1]){
					case 'V':operand+=4;i++; break;
					case 'X':operand+=9;i++; break;
					default:operand+=1;
					}
				};break;
			case 'O':break;
		} //end top case
		
		i++;
	}
	i--;
	//cout << "RIM: " << operand << endl;
	return operand;
}

void vypisRim(int c){
	while(c>=1000){
		out+='M';
		c-=1000;
	}
	while(c>=900){
		out+="CM";
		c-=900;
	}
	while(c>=500){
		out+='D';
		c-=500;
	}
	while(c>=400){
		out+="CD";
		c-=400;
	}
	while(c>=100){
		out+='C';
		c-=100;
	}
	while(c>=90){
		out+="XC";
		c-=90;
	}
	while(c>=50){
		out+='L';
		c-=50;
	}
	while(c>=40){
		out+="XL";
		c-=40;
	}
	while(c>=10){
		out+='X';
		c-=10;
	}
	while(c>=9){
		out+="IX";
		c-=9;
	}
	while(c>=5){
		out+='V';
		c-=5;
	}
	while(c>=4){
		out+="IV";
		c-=4;
	}
	while(c>=1){
		out+='I';
		c-=1;
	}
	cout << out << endl;
	out = "";
}
void processLine2()
{
	if (line[0] == 'R') {
		reset();
		return;
	}
	int i=0,val, temp;
	int dr=line[i]-'0';
	char oper;
	x:
		i++;
		oper=line[i++];
		if(line[i]>='0'&&line[i]<='9'){
			int a = line[i]-'0';
			val=registers[a];
			if (val<0){
			 error();
			 return;
			 }
		}
		else{
			val=parseRim(i);
			
		}
		switch (oper){
			case '+': temp += val; break;
			case '-': temp -= val;break;
			case '=': temp = val;break;
		}
		if (line[i+1]!='\0') goto x;
	if(temp<0||temp>10000) error();
	else{
		//cout << "hodnota " << temp << endl;
	 	registers[dr]=temp;
	 	cout << dr<<"="<<flush;
	 	vypisRim(registers[dr]);
	 }
}


int main()
{
	while(1){
		cin.getline(line,10001);
		//cout << line << endl;
		
		if (line[0]=='Q') break;
		processLine2();
	}
	cout<< "Bye" << endl;
}