#include <bits/stdc++.h>

[[nodiscard]] static inline constexpr char solve(const std::string& S) noexcept
{
	static constexpr std::string target("yukicoder?");
	return std::accumulate(target.begin(), target.end(), UINT32_C(0), std::bit_xor()) ^ std::accumulate(S.begin(), S.end(), UINT32_C(0), std::bit_xor());
}

int main()
{
	std::cin.tie(nullptr);
	std::ios::sync_with_stdio(false);
	
	std::string S;
	S.reserve(9), std::cin >> S;

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