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

Sentence: 'the snowboarder wearing a dark helmet sprays snow into the air'. Find frequency of the letter 'w'
3

Sentence: 'an old boat on a beach near a large body of water'. Find frequency of the letter 'a'
8

Sentence: 'a small white vase of purple flowers on a table'. Find frequency of the letter 'p'

2