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

Ex Input:
Sentence: 'a comical frowning faced sculpture sits atop a surfboard next to a frowning man'. Count the occurrences of the word 'frowning' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a cat is standing on a green bench looking on'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a little girl in a red dress plays frisbee with an old man in a grassy area'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3