#include<iostream>
#include<vector>
#include<algorithm>
#include<cmath>
using namespace std;
int main(){ 
    string name,s;
    int count = 0;
    cin >> name;
    for(int i=0;i<8;i++){
        cin >> s;
        for(int j=0;j<s.size();j++){
            if(s[j]=='w'||s[j]=='b')    count++;
        }
    }
    if(count%2==0){
        if(name=="oda") cout <<"oda";
        else    cout << "yukiko";
    }
    else{
        if(name=="oda")  cout << "yukiko";
        else    cout << "oda";
    }
    return 0;
}