Input: Identify the most salient words:

a town an ancient city in the southwest of country hewn from towering walls of rock

Output: city
country
rock
southwest
town

Input: Identify the most salient words:

cactus growing from the rocks

Output: cactus
grow
rock

Input: Identify the most salient words:

A woman is waving and smiling and being asked the question "how can we survive."

Output: ask
smile
wave

Input: Identify the most salient words:

this house has an area of square feet of living space

Output:
area
house
live
space