#include <iostream>
#include <string>

using namespace std;

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