［AtCoder］ABC-404｜A - Not Found

設問ページ

• 🔗ABC-404 A - Not Found

提出結果

def getString():
    return input()


def main():
    S = getString()

    for i in range(26):
        c = ord("a") + i
        if chr(c) in S:
            continue
        else:
            print(chr(c))
            break


if __name__ == "__main__":
    main()