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

Q: Sentence: 'man in air skateboarding on street with building'. Find frequency of the letter 't'

A: 4
****
Q: Sentence: 'a couple of men standing inside of a liquor store'. Find frequency of the letter 'p'

A: 1
****
Q: Sentence: 'woman carrying her luggage down busy street of green'. Find frequency of the letter 'r'

A:
5
****