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: 'a bed with a mattress that has nothing on it'. Find frequency of the letter 'a'
5

Sentence: 'a boat anchored in a river near trees'. Find frequency of the letter 'e'

5