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

Q: Sentence: 'a young boy wearing black and holding a skateboard on the sidewalk'. Find frequency of the letter 'n'

A: 5
****
Q: Sentence: 'a sheep in a field in front of other sheep'. Find frequency of the letter 'f'

A: 3
****
Q: Sentence: 'a male with a beard is at a snowboard shop'. Find frequency of the letter 'b'

A:
2
****