// https://yukicoder.me/submissions/99977
#include<bits/stdc++.h>

using namespace std;
typedef long long int ll;

#define debugv(v) printf("L%d %s => ",__LINE__,#v);for(auto e:v){cout<<e<<" ";}cout<<endl;
#define debugm(m) printf("L%d %s is..\n",__LINE__,#m);for(auto v:m){for(auto e:v){cout<<e<<" ";}cout<<endl;}
#define debugaa(m,w,h) printf("L%d %s is..\n",__LINE__,#m);for(int y=0;y<(h);y++){for(int x=0;x<(w);x++){cout<<(m)[x][y]<<" ";}cout<<endl;}
#define ALL(v) (v).begin(),(v).end()
#define BIGINT 0x7FFFFFFF

template<typename T1,typename T2>
ostream& operator <<(ostream &o,const pair<T1,T2> p){o<<"("<<p.first<<":"<<p.second<<")";return o;}


int main(){
    int i,j,k,l;
    int m,n;
    
    char buff[256];
    
    scanf("%s",buff);
    
    k=0;
    while (0<=scanf("%s",buff+1)){
        for (i=1;i<=8;i++){
            k+=buff[i]=='.';
        }
    }
    
    if ((buff[0]=='y') == (k&1)){
        cout << "oda" << endl;
    }else{
        cout << "yukiko" << endl;
    }

    return 0;
}