#include <iostream>
#include <vector>
#include <algorithm>
#include <functional>
#include <queue>
#include <map>
#include <cmath>
#include <iomanip>
#include <set>
#include <cstdio>

using namespace std;

string v[] = {"C","C#","D","D#","E","F","F#","G","G#","A","A#","B","C"};

int main() {
  string s;
  cin >> s;
  for (int i = 0; i < 13; i++) {
    if (v[i] == s) {
      cout << v[i + 1] << endl;
      return 0;
    }
  }
  return 0;
}