#include<iostream>
#include<string>
#define rep(i,a) for(int i=0;i<(a);++i)

int main()
{
	std::string s;
	std::cin >> s;

	rep( i, s.size() )
		std::cout << char((s[i]-'A'-i-1+26*40)%26+'A');

	std::cout << std::endl;

	return 0;
}