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

Q: Sentence: 'a commuter bus in england by a clock tower building'. Find frequency of the letter 'w'

A: 1
****
Q: Sentence: 'a couple of men standing inside of a liquor store'. Find frequency of the letter 'p'

A: 1
****
Q: Sentence: 'three cows in a grass field eating grass'. Find frequency of the letter 'e'

A:
4
****