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: a coyple of zebras that are walking around
Example Output: coyple

Example Input: Fou frames of different people doing various activity's.
Example Output: Fou

Example Input: There is a pitcure of a traffic sign with north and south arrows in the foreground and a graveyard in the back ground on a projectable slide.
Example Output:
pitcure