#include <bits/stdc++.h>

[[nodiscard]] static inline constexpr std::string solve(std::string&& S) noexcept
{
	for (uint_fast32_t i = 0; i != S.size(); ++i)
		S[i] = ((S[i] - 'A') + (26 - (i + 1) % 26)) % 26 + 'A';

	return S;
}

int main()
{
	std::cin.tie(nullptr);
	std::ios::sync_with_stdio(false);

	std::string S;
	S.reserve(1024), std::cin >> S;

	std::cout << solve(std::move(S)) << '\n';
	return 0;
}