#include <iostream>	//cin, cout
#include <vector>	//vector
#include <algorithm> //sort,min,max
#include <string>	//string
#include <ios>		//fixed
#include <iomanip>	//setprecision

using namespace std;

int main() {

	string S;
	cin >> S;

	for (unsigned int i = 0; i < S.length(); i++) {
		S[i] = S[i] - (i + 1) % 26;
		if (S[i] < 65) {
			S[i] = S[i] + 26;
		}
	}

	cout << S << endl;

	return 0;

}