def main():
    S = input()
    if S == "oda":
        opponent = "yukiko"
    else:
        opponent = "oda"

    total_discs = 0
    for i in range(8):
        # i行目の処理
        discs = list(input())
        total_discs += 8 - discs.count(".")
    # print(total_discs)
    if total_discs % 2 == 0:
        print(S)
    else:
        print(opponent)

if __name__ == '__main__':
    main()