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

Input: Consider Input: Sentence: 'a man sitting on a bench in a lobby'. Count the occurrences of the word 'a' in the given sentence.

Output: 3

Input: Consider Input: Sentence: 'an adult skier holds the hand of a child skier in the snow'. Count the occurrences of the word 'skier' in the given sentence.

Output: 2

Input: Consider Input: Sentence: 'a woman on a boat points off into the distance of a lake'. Count the occurrences of the word 'a' in the given sentence.
Output: 3