s = str(input())
c = 0
for i in range(8):
    B = str(input())
    for j in range(8):
        if B[j] != '.':
            c += 1

if c%2 == 0:
    print(s)
else:
    if s == 'oda':
        print('yukiko')
    else:
        print('oda')