The given sentence contains a typo which could be one of the following four types: (1) swapped letters of a word e.g. 'niec' is a typo of the word 'nice'. (2) missing letter in a word e.g. 'nic' is a typo of the word 'nice'. (3) extra letter in a word e.g. 'nicce' is a typo of the word 'nice'. (4) replaced letter in a word e.g 'nicr' is a typo of the word 'nice'. You need to identify the typo in the given sentence. To do this, answer with the word containing the typo.

Input: Consider Input: Four ejts fly overhead trailing smoke with a clear blue sky.

Output: ejts


Input: Consider Input: Two cars are stopped at a red light and transit buses are in the backround.

Output: backround.


Input: Consider Input: A paor of people on skis ride down a hill.


Output: paor