S = input()
B = [input() for _ in range(8)]
count = 0
for i in range(8):
    for j in range(8):
        if B[i][j] != '.':
            count += 1
if S == 'oda':
    T = 'yukiko'
else:
    T = 'oda'
if count & 1 == 0:
    print(S)
else:
    print(T)