#include <bits/stdc++.h>

using namespace std;

string up(string x) {
    if (x == "C") return "C#";
    if (x == "D") return "D#";
    if (x == "E") return "F";
    if (x == "F") return "F#";
    if (x == "G") return "G#";
    if (x == "A") return "A#";
    if (x == "B") return "C";
    return "";
}

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

    cout << up(s) << endl;

    return 0;
}