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

Ex Input:
Sentence: 'a group of three toilets with a person standing in front of the middle one'. Count the occurrences of the word 'toilets' in the given sentence.

Ex Output:
1


Ex Input:
Sentence: 'a black counter top of a stove inside a kitchen'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a crowd is watching a dog catching a frisbee in a pen'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

4