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

Sentence: 'a man with glasses adjusting his tie in a mirror'. Find frequency of the letter 's'
5

Sentence: 'bananas are being dried in a tropical setting'. Find frequency of the letter 'i'
5

Sentence: 'person seated at slatted wooden table with two cups of coffee, bagel breakfast sandwich and condiments'. Find frequency of the letter 'w'

4