Alien Language Dictionary

You are given a list of words sorted lexicographically in an alien language. Each word consists of lowercase English letters. Your task is to deduce the order of the letters in this alien language. Return the order of characters as a string. The input format is as follows: Input: - First line: an integer n (1 ≤ n ≤ 100) - number of words. - Next n lines: the words themselves - each consists of only lowercase English letters and has a length between 1 and 100. Output: - A string representing the order of characters. Example: Input: 3 wrt wrf er Output: wert