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

Ex Input:
Sentence: 'train cars lined up under a bridge full of traffic'. Count the occurrences of the word 'under' in the given sentence.

Ex Output:
1


Ex Input:
Sentence: 'a nick knack of a dog a coffee cup and a tray of food'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
4


Ex Input:
Sentence: 'a tennis player stretching to hit a ball'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

2