/**
 *  Numeral System (PKU 2685)
 *  by Kenji Inoue, 2006-12-30
 **/

#include <iostream>
#include <string>

using namespace std;

char c[4] = {'m', 'c', 'x', 'i'};
int v[4] = {1000, 100, 10, 1};

int toint(string s) {
  int sum = 0;

  int d = 1;
  for (int i=0; i<s.size(); i++) {
    if ('0' <= s[i] && s[i] <= '9') {
      d = s[i] - '0';
    } else {
      for (int j=0; j<4; j++) {
        if (s[i] != c[j]) { continue; }

        sum += v[j] * d;
        d = 1;
        break;
      }
    }
  }

  return sum;
}

int main() {
  int N;
  string s1, s2;

  cin >> N;
  while (N--) {
    cin >> s1 >> s2;
    int sum = toint(s1) + toint(s2);

    for (int i=0; i<4; i++) {
      int d = 0;
      while (sum >= v[i]) { sum -= v[i]; d++; }
      if (d > 1) { cout << d; }
      if (d > 0) { cout << c[i]; }
    }

    cout << endl;
  }

  return 0;
}