#include <bits/stdc++.h>
using namespace std;

int main() {
  const string s = "ABCDEFGHIJ";
  char x, y;
  cin >> x >> y;
  int pos = (x - 'A') + (y - 'A');
  string ans;
  while (pos) {
    ans += s[pos % 10];
    pos /= 10;
  }
  reverse(ans.begin(), ans.end());
  if (ans.size() == 0) cout << 'A';
  else cout << ans;
  return 0;
}