#include<iostream>
using namespace std;

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