TASK DEFINITION: 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.
PROBLEM: A tebnnis player is making a serve in a tennis match.

SOLUTION: tebnnis

PROBLEM: A buasy city street at night time as some people cross the street.

SOLUTION: buasy

PROBLEM: A cat is balancing on the arm and back of a desk chiar.

SOLUTION:
chiar.