#include <cstdio>
using namespace std;
int main()
{
    char c[9];
    char y[] = { 'y','u','k','i','c','o','d','e','r' };
    
    for (int i = 0; i < 9; ++i) {
        scanf("%c", &c[i]);
    }
    
    for (int i = 0; i < 9; ++i) {
        if (c[i] == '?') {
            printf("%c\n", y[i]);
            break;
        }
    }
    
    return 0;
}