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: Two eople walking over a bridge while holding umbrellas.
Example Output: eople

Example Input: A city street has cars and buses with a green traffic light near a street sifgn.
Example Output: sifgn.

Example Input: Fisn, fries, and a salad are sitting grouped  together as a meal.
Example Output:
Fisn,