first = input()
if first == "oda":
    second = "yukiko"
elif first == "yukiko":
    second = "oda"

s = [input() for i in range(8)]
cnt = 0
for i in range(8):
    cnt += s[i].count("b") + s[i].count("w")

if cnt % 2 == 0:
    print(first)
else:
    print(second)