#include<iostream>
using namespace std;

int main() {
	char s;
	cin >> s;
	if (s == 'C' or s == 'A' or s == 'D' or s == 'F' or s == 'G')	cout << s<<'#'<< endl;
	else if (s == 'E') cout << 'F' << endl;
	else cout << 'C' << endl;

	
	return 0;
}