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 lasdy on a bike and people riding a horse carriage

Ex Output:
lasdy


Ex Input:
Teenagers skateboard on the concrete outside a commercial buildoing.

Ex Output:
buildoing.


Ex Input:
A paneled room containing a bed, a tapestry, framed artwork and a lignht.

Ex Output:

lignht.