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

int main()
{
  map<char, string> outputTable = {
    {'C', "C#"},
    {'D', "D#"},
    {'E', "F"},
    {'F', "F#"},
    {'G', "G#"},
    {'A', "A#"},
    {'B', "C"},
  };
  char S;
  cin >> S;
  cout << outputTable[S] << endl;
}