s = input()
y = "yukiko"
o = "oda"

B = [list(input()) for _ in range(8)]

b, w = 0, 0
for i in range(8):
    for j in range(8):
        if B[i][j] == "b":
            b += 1
        elif B[i][j] == "w":
            w += 1

if (b+w) % 2 == 0:
    if s == "yukiko":
        print(y)
    else:
        print(o)
else:
    if s == "yukiko":
        print(o)
    else:
        print(y)