In this task, you need to count the occurrences of the given word in the given sentence.

Sentence: 'a truck and luggage sitting on a cart by the dining saloon car of a train'. Count the occurrences of the word 'a' in the given sentence.
3

Sentence: 'a man wearing jeans and a tshirt with a cell phone on his belt'. Count the occurrences of the word 'belt' in the given sentence.
1

Sentence: 'a man wearing a blue shirt and eating a pizza on a tray on his lap'. Count the occurrences of the word 'a' in the given sentence.
4