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.

Example Input: theer are two giraffes that are looking over a fence
Example Output: theer

Example Input: A resd double decker metro bus rounds the corner of a city street.
Example Output: resd

Example Input: A fiee hydrant that is sitting on the sidewalk.
Example Output:
fiee