#include <iostream>
using namespace std;
int main(){
    string s;cin>>s;
    int k = 0;
    for(int i = 0; 64 > i; i++){
        char t;cin>>t;
        if(t != '.')k++;
    }
    if(!(k%2)){
        cout << s << endl;
    }else{
        if(s == "oda"){
            cout << "yukiko" << endl;
        }else{
            cout << "oda" << endl;
        }
    }
}