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

Ex Input:
Sentence: 'a small child takes a bite of a donut'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3


Ex Input:
Sentence: 'a man riding skis on a snow covered ski slope'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
2


Ex Input:
Sentence: 'a shiny antique bus coming though a gate by a brick building'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:

3