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 kite flying in the sky over tree.

A: tree.
****
Q: A LO OF PEOPLE ARE ON BOATS IN THE WATER

A: LO
****
Q: A frreight train passing through a railroad switch yard.

A:
frreight
****