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

Ex Input:
Sentence: 'a man on a flat truck is behind a large group of farm animals'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a wooden rail covered in snowboards on a snow covered mountain'. Count the occurrences of the word 'covered' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man on a horse about to go through a jumping course'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3