s = input()
if s == 'oda':
    g = 'yukiko'
else:
    g = 'oda'

b = 0
w = 0
for _ in range(8):
    l = list(input())
    b += l.count('b')
    w += l.count('w')

print([g, s][(b+w) % 2 == 0])