#include <iostream>
#include <string>

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

    char yc[9] = {'y', 'u', 'k', 'i', 'c', 'o', 'd', 'e', 'r'};

    for (int i = 0; i < 9; i++) {
        if (s[i] == '?') {
            std::cout << yc[i] << std::endl;
            break;
        }
    }
}