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

Ex Input:
Sentence: 'a couple of elephants out in the field having a snack'. 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


Ex Input:
Sentence: 'one baseball player slides to a base while another player holds up his hands'. Count the occurrences of the word 'player' in the given sentence.

Ex Output:

2