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: An electronics case next to a microphone and with a cell phone on to.
Example Output: to.

Example Input: A dek covered in both desktop computers and a laptop.
Example Output: dek

Example Input: Several people are at the skate park and one kid is getting some aier.
Example Output:
aier.