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

[EX Q]: Sentence: 'a group of cows standing next to each other'. Count the occurrences of the word 'a' in the given sentence.
[EX A]: 1

[EX Q]: 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.
[EX A]: 3

[EX Q]: Sentence: 'a small cat is sitting on a step by a door'. Count the occurrences of the word 'a' in the given sentence.
[EX A]:
3