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

int main()
{
  string S;
  cin >> S;
  if(S == "A" || S == "C" || S == "D" || S == "F" || S == "G") {
    cout << S+"#";
  }else if(S=="E") {
     cout << "F";
  }else if (S=="B") {
    cout << "C";
  }
}