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

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 small bird perched on a branch in a tree'. Count the occurrences of the word 'a' in the given sentence.
3

Sentence: 'this is a blurry image of a man in a kitchen'. Count the occurrences of the word 'a' in the given sentence.

3