#include <bits/stdc++.h>
#include <vector>
#include <iostream>
#include <map>
#include <string>
#include <cmath>
#include <algorithm>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
using ll = long long;
using P = pair<int, int>;

int main() {
    
    char S;
    cin >> S;
    if(S=='A' || S=='C' || S=='D' || S=='F' || S=='G') {
        cout << S << '#' << endl;
    }
    else {
        if(S == 'B') {
            cout << 'C' << endl;
        }
        else {
            cout << 'F' << endl;
        }
    }

}