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

Ex Input:
Sentence: 'a small cat is sitting on a step by a door'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


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


Ex Input:
Sentence: 'a man on a skate board riding on the edge of a ramp'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3