Input: Identify the most salient words:

close up hand of young man who studies the document and worked in cafe

Output: document
study
work

Input: Identify the most salient words:

cow grazing with calf lying down in the meadow

Output: calf
cow
graze
meadow

Input: Identify the most salient words:

a train that is on a train tracks that is a model

Output: model
track
train

Input: Identify the most salient words:

a computer can copy data from a cd made in operating system .

Output:
computer
operate
system