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

Example Input: Sentence: 'a woman holds a furry dog by its leash'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 2

Example Input: Sentence: 'a young smiling couple at a wedding cut a cake'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 3

Example Input: Sentence: 'a longclean and spacious kitchen with microwave and other gazette'. Count the occurrences of the word 'and' in the given sentence.
Example Output:
2