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

Sentence: 'a small wrinkley dog wearing a bow tie'. Find frequency of the letter 'e'
3

Sentence: 'three woman are having a discussion in the kitchen'. Find frequency of the letter 'n'
5

Sentence: 'the complete view of a bathroom with many things to see'. Find frequency of the letter 'i'

3