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: The man on a red bike is looking baxck.

Output: baxck.


Input: Consider Input: A chesee pizza with meat topping and few cheetos on top.

Output: chesee


Input: Consider Input: A blqack bird sitting on a ledge below a window with bars.


Output: blqack