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

Sentence: 'a woman in high heels walking a dog on a leash'. Count the occurrences of the word 'a' in the given sentence.
3

Sentence: 'a large building with a cross at the very top and a clock below it'. Count the occurrences of the word 'cross' in the given sentence.
1

Sentence: 'a baseball player is swinging at a baseball'. Count the occurrences of the word 'baseball' in the given sentence.

2