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

Example Input: Sentence: 'a man in a pitching pose with a glove near  another man with a glove'. Count the occurrences of the word 'a' in the given sentence.
Example Output: 4

Example Input: Sentence: 'a very large cow that is in a field'. Count the occurrences of the word 'large' in the given sentence.
Example Output: 1

Example Input: Sentence: 'person on the back of a horse on a snow field with snow on trees'. Count the occurrences of the word 'on' in the given sentence.
Example Output:
3