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: Peoople standing in front of grey blocked structure.

A: Peoople
****
Q: Tow orange books sit on a persons lap.

A: Tow
****
Q: A street filled with traffic and a cow walking down the middle of irt.

A:
irt.
****