代码：

from typing import List
def turePassword(wordList:List[str]) ->str:

    wordList = list(set(wordList))
    #排序先字符串长度，其次字典序
    wordList.sort(key=lambda x :(len(x),x))
    ans = ''
    for i in range(len(wordList)-1,-1,-1):
        flag = True
        for j in range(1,len(wordList[i])):
            if wordList[i][:j] not in wordList:
                flag = False
                break
        if flag:
            ans = wordList[i]
            break

    return ans
wordList = ['a','ab','abc','abcd','abcdef','nj','njk','n','njkl','z']
print(turePassword(wordList))