import math
import sys
def S(): return sys.stdin.readline().rstrip()
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int, sys.stdin.readline().rstrip().split())
def LI(): return list(map(int, sys.stdin.readline().rstrip().split()))
def LS(): return list(sys.stdin.readline().rstrip().split())

s = S()
cnt = 0

for i in range(8):
    b = S()
    cnt += b.count(".")

if cnt%2 == 0:
    print(s)
else:
    if s == "oda":
        print("yukiko")
    else:
        print("oda")