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.

Q: Purople lilacs in a watering can on a windowsill.

A: Purople
****
Q: Two rtoothbrushes are in a holder with dental floss.

A: rtoothbrushes
****
Q: A group of people riding on the backs of elephanst.

A:
elephanst.
****