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 laotop on the floor with a cat on the laptop
answer:
laotop


question:
Fouer people waiting for a ski lift up a mountain.
answer:
Fouer


question:
a sign showing west campbell street and a huge clock with the words assurance socieyt.
answer:

socieyt.