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: An oeange is top of an assortment of green apples.
Example Output: oeange

Example Input: a chld wearing a polka dot tie and a white shirt.
Example Output: chld

Example Input: A balck cat next to a photograph of a cat.
Example Output:
balck