#include<iostream>
#include<stdio.h>
#include<vector>
#include<algorithm>

#define MAX 64
using namespace std;

int main(){


    string name;
    char board[MAX];

    cin >>name;
    int cnt=0;
    for(int i=0; i<MAX; i++){
        cin>> board[i];
        if(board[i] == '.'){
            cnt++;
        }
    }

    if(cnt%2==0){
        cout<< name<< endl;
    }else if(name == "oda"){
        cout<< "yukiko"<< endl;
    }else{
        cout<< "oda"<< endl;
    }

    return 0;
}