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 bed in a adrk room in front of a window with the sun shining in.
Example Output: adrk

Example Input: Several jites being flown in the sky that are attached to each other by strings.
Example Output: jites

Example Input: Zeberas are walking on the green as birds fly over
Example Output:
Zeberas