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: A nman on a horse going down a track.
Example Output: nman

Example Input: A red and tyellow fire hydrant in a grass lawn next to a sidewalk and two street signs attached to a wood post.
Example Output: tyellow

Example Input: A laerge number of police motorcycles are lined up.
Example Output:
laerge