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

Ex Input:
Sentence: 'a person on a beach flying a kite in the sky'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a man holding a glove on a baseball field'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'one man playing the wii by his lonesome'. Count the occurrences of the word 'by' in the given sentence.

Ex Output:

1