#include<stdio.h>
#include<string.h>
main(){
    char S[7];
    char name[][7] = {"oda","yukiko"};
    scanf("%s\n",S);
    int count = 0;
    char c;
    for(int i = 0;i < 8;i++){
        while((c=getchar()) != '\n'){
            count += (c=='w' | c=='b');
        }
    }
    int turn = strcmp(S,"oda")?1:0;//odaなら0 yukikoなら1
    printf("%s\n",name[turn^(count%2)]);
}
/*
偶数なら次の手は先手
 0 0 - oda(0)
 0 1 - yukiko(1)
 1 0 - yukiko(1)
 1 1 - oda(0)
 */