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

Input: Consider Input: Sentence: 'a train on a train track next to a concrete platform'. Count the occurrences of the word 'a' in the given sentence.

Output: 3

Input: Consider Input: Sentence: 'a red and whit jet blue sky and clouds'. Count the occurrences of the word 'and' in the given sentence.

Output: 2

Input: Consider Input: Sentence: 'a toddler and baby on a wooden floor scatter with papers'. Count the occurrences of the word 'a' in the given sentence.
Output: 2