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

Ex Input:
Sentence: 'a woman holding a child are looking at a cow over a fence'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
4


Ex Input:
Sentence: 'a man in a suit pinstriped shirt and red tie'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'the commuter train is crossing the deep river'. Count the occurrences of the word 'the' in the given sentence.

Ex Output:

2