instruction:
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.
question:
a grey cat staring silted  at windw
answer:
windw


question:
A baseball player takes some practice swings in the on deck circlre
answer:
circlre


question:
A yougn man standing in the ocean next to a hovering blue surfboard.
answer:

yougn