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

Ex Input:
Sentence: 'someone is holding up a hot dog with cheese on a bun'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a yellow sign warns of a plank surface in front of a large gray building'. Count the occurrences of the word 'yellow' in the given sentence.

Ex Output:
1


Ex Input:
Sentence: 'a man walking down a narrow hallway with a backpack'. Count the occurrences of the word 'walking' in the given sentence.

Ex Output:

1