Input: Identify the most salient words:

if only wallpaper containing a portrait and skin titled if only

Output: contain
portrait
wallpaper

Input: Identify the most salient words:

different coloured lights adorned the streets of the city .

Output: adorn
light
street

Input: Identify the most salient words:

An airplane is on the airstrip preparing to take off.

Output: airplane
airstrip
prepare

Input: Identify the most salient words:

A large open place in a city where people have gathered.

Output:
city
gather
place