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

Sentence: 'a knife a cutting board some bananas and a toaster'. Find frequency of the letter 'i'
2

Sentence: 'eight donuts are cooked together in oil in a metal tray'. Find frequency of the letter 'h'
2

Sentence: 'a desk sits in the corner of a small room'. Find frequency of the letter 'a'

3