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

Ex Input:
Sentence: 'a person on a sandy beach throwing a frisbee'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'real to life dummy stuffed into a suitcase'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
1


Ex Input:
Sentence: 'a flock of ducks swimming across a lake'. Count the occurrences of the word 'lake' in the given sentence.

Ex Output:

1