#include<iostream>
#include<string>
using namespace std;
int main() {
	string S;
	cin >> S;
	string s = { 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z' };
	for (int i = 0; i < S.length(); i++) {
		for (int j = 0; j < 26; j++) {
			if (S[i] == s[j]) {
				S[i] = s[((j - i - 1) % 26 + 26) % 26];
				break;
			}
		}
	}
	cout << S << endl;
}