p1 = input()
if p1 == "oda":
    p2 = "yukiko"
else:
    p2 = "oda"

c = 0
for x in range(8):
    str = input()
    c += str.count("w")
    c += str.count("b")

if c%2 == 0:
    print(p1)
else:
    print(p2)