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

Sentence: 'a row of vintage cars in a grassy field'. Find frequency of the letter 'v'
1

Sentence: 'a laptop computer with pictures of giraffes on the homescreen'. Find frequency of the letter 'o'
5

Sentence: 'a group of people are sitting on wooden benches on a sidewalk'. Find frequency of the letter 'l'

2