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(b, w)

if b % 2 == 0 and w % 2 == 0:
    print(s)

elif b % 2 != 0 and w % 2 == 0:
    print(s)

elif b % 2 == 0 and w % 2 != 0:
    print(g)