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

Sentence: 'a red stop sign covered in graffiti under a train crossing'. Count the occurrences of the word 'a' in the given sentence.
2

Sentence: 'a young man cutting a pizza on top of a table'. Count the occurrences of the word 'a' in the given sentence.
3

Sentence: 'a dog sleeping on a chair in the living room'. Count the occurrences of the word 'room' in the given sentence.

1