#include<bits/stdc++.h>
using namespace std;

int main(){
    string s1,s2,in;
    int ans=0;

    cin >> s1;
    if(s1=="oda") s2="yukiko";
    else s2="oda";
    while(cin >> in){
        for(int i=0;i<in.size();i++){
            if(in[i]=='w' || in[i]=='b') ans++;
        }
    }
    if(ans%2==0) cout << s1 << endl;
    else cout << s2 << endl;

    return 0;
}