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

Sentence: 'a little boy petting a prize winning llama'. Count the occurrences of the word 'little' in the given sentence.
1

Sentence: 'a man is looking slyly at the camera while sitting at his laptop at a desk'. Count the occurrences of the word 'at' in the given sentence.
3

Sentence: 'a man dressed in uniform touching a subway door with a full subway'. Count the occurrences of the word 'a' in the given sentence.
3