from collections import *
from itertools import *
from functools import *
import math,sys
input = sys.stdin.readline

S = input()[:-1]
B = [input()[:-1] for _ in range(8)]
cnt = 0
for b in B:
    cnt += b.count('.')
if cnt%2==0:
    print(S)
else:
    if S=='oda':
        print('yukiko')
    else:
        print('oda')