#include<iostream>
#include<string.h>

using namespace std;

int main(){
	char S[1024];
	cin >> S;

	for (int i = 0; i < strlen(S); i++){
		S[i] -= (i%26 + 1);
		if (S[i] < 'A')	S[i] = 'Z';
		cout << S[i];
	}

	cout << endl;

	return 0;
}