#include <iostream>
#include <string>
using namespace std;

string genrim(int p) {
    string ret;
    
    ret = "";
    if(p/10 == 1) ret = "X";
    if(p/10 == 2) ret = "XX";
    if(p/10 == 3) ret = "XXX";
    if(p/10 == 4) ret = "XL";
    if(p/10 == 5) ret = "L";    
    if(p/10 == 6) ret = "LX";    
    if(p/10 == 7) ret = "LXX";    
    if(p/10 == 8) ret = "LXXX";
    if(p/10 == 9) ret = "XC";
    
    if(p%10 == 1) ret += "I";
    if(p%10 == 2) ret += "II";    
    if(p%10 == 3) ret += "III";    
    if(p%10 == 4) ret += "IV";
    if(p%10 == 5) ret += "V";
    if(p%10 == 6) ret += "VI";
    if(p%10 == 7) ret += "VII";    
    if(p%10 == 8) ret += "VIII";    
    if(p%10 == 9) ret += "IX";
    
    return ret;
}

int kchar(char x, string p) {
    int i, ret=0;
    
    for(i=0; i<p.size(); i++)
        if(p[i] == x) ret++;
        
    return ret;
}

int main() {
    string inp;
    cin >> inp;
    
    for(int i = 1; i < 100; i++) {
        string t = genrim(i);
        
        if(
            kchar('I', inp)==kchar('I', t)
            && kchar('X', inp)==kchar('X', t)
            && kchar('C', inp)==kchar('C', t)
            && kchar('L', inp)==kchar('L', t)
            && kchar('V', inp)==kchar('V', t)
            && kchar('I', inp)==kchar('I', t)) { cout << t << endl; break; }
            
        }
        
    //system("pause");
}