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:
Thre zebra walk in an enclosure next to a wall.

Ex Output:
Thre


Ex Input:
A steet sign that is in a foreign language.

Ex Output:
steet


Ex Input:
RED KLIGHTING IN A BATHROOM, WITH HAND PRINTS ON SHOWER CURTAIN

Ex Output:

KLIGHTING