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

Sentence: 'a cat with a pensive look guarding its plate by a computer'. Count the occurrences of the word 'a' in the given sentence.
3

Sentence: 'a sandwich with meat and sauce on a plate'. Count the occurrences of the word 'sauce' in the given sentence.
1

Sentence: 'a man on the sidewalk pulling a suitcase'. Count the occurrences of the word 'a' in the given sentence.

2