S = input()
B = [input() for i in range(8)]
c = sum(1 for Bi in B for b in Bi if b == "w" or b == "b")
if S == "oda":
    if c % 2 == 0:
        print("oda")
    else:
        print("yukiko")
else:
    if c % 2 == 0:
        print("yukiko")
    else:
        print("oda")