#include <bits/stdc++.h>
using namespace std;

int main(){
    string s;
    cin>>s;
    if(s=="E"){
        cout<<"F"<<endl;
        return 0;
    }
    if(s=="B"){
        cout<<"C"<<endl;
        return 0;
    }   
    cout<<s<<"#"<<endl;
    return 0;
}