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Alien dictionary

Hard
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Average time to solve is 46m
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Problem statement

You have been given a sorted (lexical order) dictionary of an alien language.


Write a function that returns the order of characters as a string in the alien language. This dictionary will be given to you as an array of strings called 'dictionary', of size 'N'.


Example :
If the dictionary consists of the following words:-
["caa", "aaa", "aab"], and 'K' is 3.

Then, the order of the alphabet is -
['c', 'a', 'b']
Note:
If the language consists of four letters, the four letters should be the starting four letters of the English language. 

However, their order might differ in the alien language.
Detailed explanation ( Input/output format, Notes, Images )
Sample Input 1 :
3 1
a aa aaa
Sample Output 1 :
true
Explanation For Sample Output 1 :
The words are 'a', 'aa', and 'aaa'. Since the unique character here is 'a', the array to be returned will just be ['a']. 

The 'true' being printed signifies that the output returned by the function is valid.
Sample Input 2 :
3 3
caa aaa aab
Sample Output 2 :
true
Constraints :
1 ≤ N ≤ 300
1 ≤ K ≤ 26
1 ≤ Length of words ≤ 50

Time Limit: 1 sec
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