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

Sentence: 'a reflection of a wild animal in a side view mirror'. Count the occurrences of the word 'a' in the given sentence.
3

Sentence: 'several sheet grazing on greens near some mountains'. Count the occurrences of the word 'mountains' in the given sentence.
1

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

2