Python3 代码

while True:
    n = int(input())
    if n == 0:
        break

    s = [""] * 200
    s_len = n

    mlen = 200
    for i in range (n):
        s[i] = input()
        if mlen > len(s[i]):
            mlen = len(s[i])

    is_success = True
    for j in range (mlen):

        ms2 = s[0][len(s[0]) - 1 - j]
        for k in range (1, s_len):
            if s[k][len(s[k]) - 1 - j] != ms2:
                is_success = False
                break

        if not is_success:
            print (s[0][len(s[0]) - j:])
            break

    if is_success:
        print (s[0][len(s[0]) - mlen:])