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

Ex Input:
Sentence: 'a crowd of people standing next to a bus'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'the man with many graphic novels on a display table is on a cell phone'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a tennis player getting ready to hit a ball on a tennis court'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3