#include <iostream>
#include <string>

using namespace std;

int main(void) {
	string S;

	cin >> S;

	for(unsigned i = 0; i < S.length(); i++){
		S[i] = 'A' + (S[i] - 'A' - (i + 1) + 26 * (i / 26 + 1)) % 26;
	}

	cout << S << endl;

	return 0;
}