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

Sentence: 'baseball player reaching back as he's about to throw the ball'. Find frequency of the letter 'e'
5

Sentence: 'a very big nice looking living room with nice furnishings'. Find frequency of the letter 'e'
3

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

1