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

Ex Input:
Sentence: 'a gray bird about to perch on a branch'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man in a hat is at a table with his laptop'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a slice of pizza that is sitting on a plate on a table'. Count the occurrences of the word 'slice' in the given sentence.

Ex Output:

1