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

Ex Input:
Sentence: 'a giant clock mounted on a building'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a table set with plates and a cat'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a black cat with a red tag sitting down with a bookshelf in the background'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3