There is a new alien language which uses the latin alphabet. However, the order among letters are unknown to you. You receive a list of non-empty words from the dictionary, where words are sorted lexicographically by the rules of this new language. Derive the order of letters in this language.

Example 1:

Input:

[

  "wrt",

  "wrf",

  "er",

  "ett",

  "rftt"

]

Output: "wertf"

题目

给定一组单词，已知这些单词的排列顺序是符合某种奇怪的字典序的。请求出这种字典序下各个字母的排列顺序，对于存在多种答案者，给出任一即可。

思路

代码

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