#include <iostream>
#include <string>
#include <ctype.h>
#include <stdio.h>
using namespace std;

string itos(int p){
  char buffer[100];
  sprintf(buffer, "%d", p);
  return string(buffer);
}
string f(int p){
  if(p == 1){return "";}
  return itos(p);
}

string q(int p){
  string ret;
  if(p >= 1000){
    ret = f(p / 1000) + "m";
  }
  p %= 1000;
  if(p >= 100){
    ret = ret + f(p / 100) + "c";
  }
  p %= 100;
  if(p >= 10){
    ret = ret + f(p / 10) + "x";
  }
  p %= 10;
  if(p >= 1){
    ret = ret + f(p) + "i";
  }
  return ret;
}
int p(string & s){
  int sum = 0;
  int t[256];
  t['c'] = 100;
  t['x'] = 10;
  t['m'] = 1000;
  t['i'] = 1;
  for(int i = 0; i < s.size(); i++){
    if(isdigit(s[i])){
      sum += (s[i] - '0') * t[s[i + 1]];
      i++;
    }else{
      sum += t[s[i]];
    }
  }
  return sum;

}
int main(){
  int n;
  cin >> n;
  for(int i = 0; i < n; i++){
    string s1, s2;
    cin >> s1 >> s2;
    //cout << s1 << ' ' << s2 << endl;
    //cout << p(s1) << ' ' << p(s2) << endl;
    cout << q(p(s1) + p(s2)) << endl;;
  }
}