S = input()
cnt = 0
p = ''
for i in range(8):
    for b in input():
        if b == 'w' or b == 'b':
            cnt += 1
if S == 'oda':
    if cnt & 1 == 0:
        p = 'oda'
    else:
        p = 'yukiko'
else:
    if cnt & 1 == 0:
        p = 'yukiko'
    else:
        p = 'oda'
print(p)