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

Ex Input:
Sentence: 'a tall plant protrudes from a glass vase'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2

Ex Input:
Sentence: 'a keyboard on a desk beneath a monitor'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3

Ex Input:
Sentence: 'people with sports equipment are snowboarding on the snow'. Count the occurrences of the word 'snow' in the given sentence.

Ex Output:
1