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

Q: Sentence: 'a couple of buses parked on the side of the street'. Find frequency of the letter 'b'

A: 1
****
Q: Sentence: 'three men in military suits are sitting on a bench,'. Find frequency of the letter 'a'

A: 3
****
Q: Sentence: 'someone doing a trick on a ramp with their skis on'. Find frequency of the letter 'e'

A:
3
****