#include<iostream>
using namespace std;

int main(){
	string str;
	cin >> str;
    if (str == "A"){
    	cout << "A#" << endl;
    }else if (str == "C"){
    	cout << "C#" << endl;
    }else if (str == "D"){
    	cout << "D#" << endl;
    }else if (str == "F"){
    	cout << "F#" << endl;
    }else if (str == "G"){
    	cout << "G#" << endl;
    }else if (str == "E"){
     cout << "F" << endl;
    }else if (str == "B"){
    	cout << "C" << endl;
    }	
}