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.

[EX Q]: Cat itting in a backpack looking out guiltily.
[EX A]: itting

[EX Q]: Tedsy bear in sweater sitting on shelf near plant.
[EX A]: Tedsy

[EX Q]: A yellow city bus traveling down a busy street.
[EX A]:
None