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.

Input: Consider Input: A group of people riding on the backs of elephanst.

Output: elephanst.


Input: Consider Input: Outodors, assorted steel pipes lie in crates and wooden pallets.

Output: Outodors,


Input: Consider Input: a btah room with a mirror a sink and a bath tub


Output: btah