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.

Input: Consider Input: theer is a giraffe that is eating a carrot from a persons hand

Output: theer


Input: Consider Input: a peeson sitting down and using a cellular phone.

Output: peeson


Input: Consider Input: a stuffed teddy bear wearing a tee shirt sitting on a desk


Output: None