#include <iostream>
#include <string>

int main() {
	std::string s;
	const std::string y("yukicoder");
	std::cin >> s;

	for (auto itr = s.begin(); itr != s.end(); itr++) {
		if (*itr == '?') {
			int d = std::distance(s.begin(), itr);
			std::cout << y[d] << std::endl;
			return 0;
		}
	}
}