#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
using i32 = int32_t;
using u32 = uint32_t;
using i64 = int64_t;
using u64 = uint64_t;
#define rep(i,n) for(int i=0; i<(n); i++)


int main(){
    vector<string> order = {
        "A", "A#", "B", "B", "C", "C#", "D", "D#", "E", "F", "F#", "G", "G#", "A"
    };

    string s; cin >> s;
    for (int i = 0; i < order.size(); i++) {
        if (order[i] == s) {
            cout << order[i + 1] << endl;
        }
    }
    return 0;
}




struct ios_do_not_sync {
    ios_do_not_sync() {
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
    }
} ios_do_not_sync_instance;