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[AtCoder]ABC-071|B - Not Found

2023/01/02に公開

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提出結果

def getString():
    return input()


def az_array():
    c = ord('a')
    l = []
    for i in range(26):
        l.append(chr(c + i))
    return l


def main():
    s = list(getString())
    t = list(set(s))
    t.sort()

    r = 'None'
    for c in az_array():
        if not c in t:
            r = c
            break
    print(r)


if __name__ == "__main__":
    main()

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