#include "bits/stdc++.h"
#define MOD 1000000007
#define INF 11234567890
#define in std::cin
#define out std::cout
#define rep(i,N) for(LL i=0;i<N;++i)
typedef long long int LL;

std::string S;
std::string ans;

int main()
{
	in >> S;

	rep(i, S.length())
	{
		auto tmp = (S[i] - (i + 1) % 26);
		tmp = (tmp < 'A' ? 'Z' - ('A' - tmp) + 1 : tmp);
		ans += tmp;
	}

	out << ans << std::endl;
	return 0;
}