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.

Example Input: A bech looking out onto a flooded river.
Example Output: bech

Example Input: a re white yellow and black train coming down a track
Example Output: re

Example Input: Peolpe on large bed, 3 laying down, on sitting, possibly discussing a subject.
Example Output:
Peolpe