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

Sentence: 'a picture of a machine built next to a street'. Find frequency of the letter 'x'
1

Sentence: 'the bathroom is in need of remodel'. Find frequency of the letter 'e'
5

Sentence: 'three cows and three persons on a beach in front of them'. Find frequency of the letter 'h'

4