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

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

Sentence: 'a man in his car eating a donut'. Find frequency of the letter 'm'
1

Sentence: 'a man posing on a bed next to a dresser'. Find frequency of the letter 'e'

4