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:
The man on a red bike is looking baxck.

Ex Output:
baxck.


Ex Input:
a ittle girl plays ith her skiis in the snow

Ex Output:
None


Ex Input:
A whte and grey bird on sandy area next to water.

Ex Output:

whte