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

Ex Input:
Sentence: 'there are some chairs under an umbrella at the beach'. Count the occurrences of the word 'at' in the given sentence.

Ex Output:
1


Ex Input:
Sentence: 'a sign pointing towards a mcdonalds is posted on a traffic light pole'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a motorcycle rider on a red bike some dirt and a sign'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3