Daily Coding Problem: Problem #1023 [Hard]

Good morning! Here's your coding interview problem for today.

This problem was asked by Airbnb.

You come across a dictionary of sorted words in a language you've never seen before. Write a program that returns the correct order of letters in this language.

For example, given ['xww', 'wxyz', 'wxyw', 'ywx', 'ywz'], you should return ['x', 'z', 'w', 'y'].

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