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

Ex Input:
Sentence: 'a person is skate skiing and some plants and trees'. Count the occurrences of the word 'and' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a man standing in front of a jet engine'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a commuter train running under a bridge along urban tracks'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

2