［AtCoder］ABC-260｜A - A Unique Letter

設問ページ

• 🔗ABC-260 A - A Unique Letter

提出結果

def getString():
    return input()


def main():
    s = list(getString())
    l = [s[i] for i in range(3) if s.count(s[i]) == 1]

    print(-1 if len(l) == 0 else l[0])


if __name__ == "__main__":
    main()