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

Ex Input:
Sentence: 'a crowd of people standing next to a bus'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a microwave a clothing iron and a candles make an unusual grouping'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a little girl with a blender top in her mouth'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

2