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

Ex Input:
Sentence: 'a gray bird about to perch on a branch'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2

Ex Input:
Sentence: 'hotdogs and buns grilling on a charcoal grill'. Count the occurrences of the word 'grilling' in the given sentence.

Ex Output:
1

Ex Input:
Sentence: 'a young man wearing an orange jacket while standing on top of a snow covered ski slope'. Count the occurrences of the word 'wearing' in the given sentence.

Ex Output:
1