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

int main()
{
  char S;
  cin >> S;
  switch (S) {
    case 'A':
      cout << "A#" << endl;
     break;
    case 'B':
      cout << "C" << endl;
     break;
    case 'C':
      cout << "C#" << endl;
      break;
    case 'D':
      cout << "D#" << endl;
     break;
    case 'E':
      cout << "F" << endl;
    break;
    case 'F':
      cout << "F#" << endl;
    break;
    case 'G':
      cout << "G#" << endl;
    break;
  }
}