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

Ex Input:
Sentence: 'a jet flying with a smaller jet attached to the top of it'. Count the occurrences of the word 'jet' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'the father and son are looking at the kites flying overhead'. Count the occurrences of the word 'the' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man running with a dog in a field full of cows'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3