def main():
    s = input()
    board = [list(input()) for _ in range(8)]
    count_dots = sum([i.count(".") for i in board])
    count = 64 - count_dots - 4

    if count % 2 == 0:
        print(s)
    elif s == "oda":
        print("yukiko")
    else:
        print("oda")


if __name__ == "__main__":
    main()