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 smqall yellow truck inside of a building.

Ex Output:
smqall


Ex Input:
A chicken meal on a shell shaped biwl.

Ex Output:
biwl.


Ex Input:
A person eiding a skateboard on the sidewalk, with green grass on each side of the walkway.

Ex Output:

eiding