#include <iostream>
#include <vector>
#include <string>
#include <algorithm>
#include <utility>
#include <iomanip>
using namespace std;
#define diff(x, y) ((x) > (y) ? ((x) - (y)) : ((y) - (x)))

int main(void) {
	string str;
	cin >> str;
	for (int i = 0; i < str.size(); i++) {
		str[i] -= i + 1;
		while (str[i] < 'A')
			str[i] += 26;
	}
	cout << str << endl;
	return 0;
}