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:
An electronics case next to a microphone and with a cell phone on to.

Ex Output:
to.


Ex Input:
A griup of sheep in the field with trees close to the river

Ex Output:
griup


Ex Input:
A bierd is flying high around a tower with a large clock on top.

Ex Output:

bierd