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.

Example Input: Ckae that has had large chunk cut out of it
Example Output: Ckae

Example Input: Tow men sit in a living room facing each other.
Example Output: Tow

Example Input: A train at a train station with a group of people standing beside i.
Example Output:
i.