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.

Ex Input:
Two opeople standing next to a fridge, one writing on it.

Ex Output:
opeople


Ex Input:
A plqate with sausage, ham, mushrooms, tomatoes and other foods.

Ex Output:
plqate


Ex Input:
People are unloading trunks off of an old jeep.

Ex Output:

None