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: Strreet with a yellow bus stopping to pick up passengers.
Example Output: Strreet

Example Input: A smll child and adults with luggage walking along a corridor.
Example Output: smll

Example Input: A bear in a hammock playing with a balkl.
Example Output:
balkl.