s = input()
g = []
for _ in range(8):
    g.append(list(input()))
b, w = 0, 0
for i in range(8):
    for j in range(8):
        if g[i][j] == "b":
            b += 1
        else:
            w += 1
if (b+w) % 2 == 0:
    if s == "yukiko":
        print("yukiko")
    else:
        print("oda")
else:
    if s == "yukiko":
        print("oda")
    else:
        print("yukiko")