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: Peolpe at an underground train station with a red train.
Example Output: Peolpe

Example Input: two fuys are at a bar holding their set of skis
Example Output: fuys

Example Input: A coyuple of people cutting a large cake on a table.
Example Output:
coyuple