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

Ex Input:
Sentence: 'a woman sleeps in a bed with a pillow and sheet'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a red blanketed bed covered in papers and a computer'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a small passenger airplane on a runway at the airport'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

2