#include <iostream>
#define ll long long
using namespace std;

int main(){
    string 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 if(s == "E") cout << "F" << endl;
    
}