#include <iostream>
#include <string>

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