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

#define rep(i, n) for (ll i = 0; i < n; i++)
#define all(x) (x).begin(),(x).end()
const long long INF = 1LL << 60;
using ll = long long;
using ld = long double;
#define v2d(type,H,W,name,value) vector<vector<type>> name(H,vector<type>(W,value));

int main()
{
  string S;
  cin >> S;

  map<string,string> mp;
  mp["A"]="A#";
  mp["B"]="C";
  mp["C"]="C#";
  mp["D"]="D#";
  mp["E"]="F";
  mp["F"]="F#";
  mp["G"]="G#";
  
  cout << mp[S] << endl;
}