Teacher: 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.
Teacher: Now, understand the problem? If you are still confused, see the following example:
It is gonig to rain today.
Solution: gonig
Reason: The word 'gonig' is a typo of the word 'going' as the characters 'i' and 'n' have been swaped.

Now, solve this instance: A tenis player returns the ball after his opponent hits it to him.
Student:
tenis