Input: Identify the most salient words:

the total number of protons and neutrons in the nucleus of an atom

Output: atom
neutron
nucleus
number
proton

Input: Identify the most salient words:

this shade of pink in the bouquet .

Output: bouquet
pink
shade

Input: Identify the most salient words:

tourists walking down the canyon to kayak and raft

Output: canyon
tourist
walk

Input: Identify the most salient words:

fireworks find a place to stay from this list of hotels .

Output:
find
place
stay