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 vaat field full of weeds and dead grass

Ex Output:
vaat


Ex Input:
A cliseup of a black and white clock on a light green wall.

Ex Output:
cliseup


Ex Input:
Man dressed in dark attire, skiing, probably cross county level terrain and snow coevred.

Ex Output:

coevred.