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]: a peson jumping a skate board in the air
[EX A]: peson

[EX Q]: A peson skiing on the snow covered mountain
[EX A]: peson

[EX Q]: A cliock tower with four faces sits on a street corner.
[EX A]:
cliock