#include <iostream>
#include <string>

using namespace std;
//変数デバッグ
#define DEB(variable) cout << #variable << "=" << variable << endl

//for簡易表記(引数ミス防止)
#define INFOR(inc, a, b) for (int inc = (a); (inc) < (b); (inc)++) //incをaにし、b-a回(iがb未満の間)処理を行う
#define DEFOR(inc, a, b) for ((inc) = (a); (inc) > (b); (inc)--)   //incをaにし、a-b回(iがbより大きい間)処理を行う

int main(){
    string former;
    char temp,count=0;
    cin >> former;

    while(cin>>temp){
            if(46==temp){
                count++;
            }
        }


    if ("oda" == former){
        if (count % 2){
                cout << "yukiko";
        }else{
        cout << "oda";
        }
    }else{
        if(count%2){
            cout << "oda";
        }else{
            cout << "yukiko";
        }
    
    }
    cout << endl;

    return 0;
}