#include <bits/stdc++.h>
using namespace std;
 
int main() {
  string S;
  cin >> S;
  if (S == "A"){
      cout << "A#" <<endl;
  }
  else if (S == "B"){
      cout << "C" <<endl;
  }
  else if (S == "C"){
      cout << "C#" <<endl;
  }
  else if (S == "D"){
      cout << "D#" <<endl;
  }
  else if (S == "E"){
      cout << "F" <<endl;
  }
  else if (S == "F"){
      cout << "F#" <<endl;
  }
  else if (S == "G"){
      cout << "G#" <<endl;
  }         
}