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: 'two giraffes, one standing and one laying down'. Find frequency of the letter 'g'
3

Sentence: 'there is a red stop sign that is on the street'. Find frequency of the letter 'h'

3