#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < (n); i++)
using namespace std;
using ll = long long;
using pii = pair<int, int>;

int main() {
  char c;
  cin >> c;
  if (c == 'A') cout << "A#" << endl;
  if (c == 'B') cout << "C" << endl;
  if (c == 'C') cout << "C#" << endl;
  if (c == 'D') cout << "D#" << endl;
  if (c == 'E') cout << "F" << endl;
  if (c == 'F') cout << "F#" << endl;
  if (c == 'G') cout << "G#" << endl;
  return 0;
}