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.

Q: A ma sitting on a couch while a boy plays a video game.

A: ma
****
Q: A mab young man riding a skateboard next to a brick building.

A: mab
****
Q: Two fguys giving a thumbs up on their skis

A:
fguys
****