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:
The audlt elephant is standing behind a young one.
answer:
audlt


question:
A cat stabnds next to a rocking chair in a room with floors that are covered in a thin sheet.
answer:
stabnds


question:
A man attempts to stand on a surfboarsd.
answer:

surfboarsd.