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

Sentence: 'a nick knack of a dog a coffee cup and a tray of food'. Count the occurrences of the word 'a' in the given sentence.
4

Sentence: 'a train on a train track next to a concrete platform'. Count the occurrences of the word 'a' in the given sentence.
3

Sentence: 'a group of people and some horses standing around by a barn'. Count the occurrences of the word 'group' in the given sentence.

1