In this task, you need to count the number of times the given letter appears in the given sentence.

Q: Sentence: 'some cubbies with towels in a blue bathroom'. Find frequency of the letter 'l'

A: 2
****
Q: Sentence: 'a man in a black shirt prepares to catch a frisbee'. Find frequency of the letter 'f'

A: 1
****
Q: Sentence: 'a fisheye lens photograph of a man sitting in a chair holding a skateboard'. Find frequency of the letter 'a'

A:
9
****