#include <iostream>
#include <map>
#include <set>
#include <string>
#include <sstream>
#include <vector>
using namespace std;

bool err=false;

map<string,int> reg;

string dv[]={"IV","IX","XL","XC","CD","CM"};
int dval[]={4,9,40,90,400,900};

string jv[]={"O","I","V","X","L","C","D","M"};
int jval[]={0,1,5,10,50,100,500,1000};

int evRim(string s) {
	if (s.size()==0) return 0;
	if (s.size()>=2) {
		string prefix=s.substr(0,2);
		for (int i=0;i<6;i++) {
			if (prefix==dv[i]) {
				return dval[i]+evRim(s.substr(2,s.size()-2));
			}
		}
	}
		for (int i=0;i<8;i++) {
			if (s[0]==jv[i][0]) return jval[i]+evRim(s.substr(1,s.size()-1));
		}
	
}

int ev(string s) {
	if (s=="O"||s.size()==0) return 0;
	if (s[0]=='+') return ev(s.substr(1,s.size()-1));
	else if (s[0]=='-') return -ev(s.substr(1,s.size()-1));
	else {
		if (s[0]>='0'&&s[0]<='9') {
			if (reg.find(s)==reg.end()||reg[s]==-1) {
				err=true; return -1;
			} else return reg[s];
		} else {
			return evRim(s);
		}

	}

}

int eval(string s) {
	vector<string> v;
	string t="";
	for (int i=0;i<s.size();i++) {
		if (s[i]=='+'||s[i]=='-') {
			v.push_back(t);
			t=s[i];
		} else {
			t+=s[i];
		}
	}
	if (t.size()>0) v.push_back(t);
	int ret=0;
	for (int i=0;i<v.size()&&!err;i++) {
		ret+=ev(v[i]);
		//cout<<"EV "<<v[i]<<" "<<ev(v[i])<<endl;
	}
	//cout<<"EVAL "<<s<<" "<<ret<<endl;
	return ret;
}

string tisicky(int x) {
	string ret="";
	for (int i=0;i<x/1000;i++) ret+="M";
	return ret;
}
string pom[]={"","I","II","III","IV","V","VI","VII","VIII","IX"};
string jednotky(int x) {	
	return pom[x%10];
}
string pom2[]={"","X","XX","XXX","XL","L","LX","LXX","LXXX","XC"};
string desiatky(int x) {
	return pom2[(x/10)%10];
}
string pom3[]={"","C","CC","CCC","CD","D","DC","DCC","DCCC","CM"};
string stovky(int x) {
	return pom3[(x/100)%10];
}

string rimske(int x) {
//	cout<<"R "<<x<<endl;
	if (x==0) return "O";
	return tisicky(x)+stovky(x)+desiatky(x)+jednotky(x);
}

int main() {
	string line;
	while (cin>>line) {
		if (line=="QUIT") { cout<<"Bye"<<endl; return 0;}
		if (line=="RESET") { cout<<"Ready"<<endl; reg.clear();} else {
		stringstream ss;
		err=false;
		for (int i=0;i<line.size();i++) 
			if (line[i]=='=') line[i]=' ';
		ss<<line;
		string r,expr;
		ss>>r>>expr;
		int val=eval(expr);
		if (err||val<0||val>10000) cout<<"Error"<<endl;
		else {
			reg[r]=val;
			cout<<r<<"="<<rimske(val)<<endl;
		}
		}
	}
}