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

int main()
{
	char c;
	cin >> c;

	map<char, string> mp;
	mp['A'] = string("A#");
	mp['B'] = string("C");
	mp['C'] = string("C#");
	mp['D'] = string("D#");
	mp['E'] = string("F");
	mp['F'] = string("F#");
	mp['G'] = string("G#");

	cout << mp[c] << endl;
}