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

Ex Input:
Sentence: 'a microwave a clothing iron and a candles make an unusual grouping'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3

Ex Input:
Sentence: 'a group of people standing around a table under a light'. Count the occurrences of the word 'a' in the given sentence.

Ex Output:
3

Ex Input:
Sentence: 'two woman and a man are seen engaging in a conversation'. Count the occurrences of the word 'conversation' in the given sentence.

Ex Output:
1