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:
A trqin with a yellow front next to an empty track.

Ex Output:
trqin


Ex Input:
tnhis is a man playing a pro sport

Ex Output:
tnhis


Ex Input:
A cart sits in the middle of a suit case while a person strokes him.

Ex Output:

cart