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

Q: Sentence: 'a small white dog looking out a car window'. Find frequency of the letter 'l'

A: 3
****
Q: Sentence: 'a chair and umbrella on a sandy beach'. Find frequency of the letter 's'

A: 1
****
Q: Sentence: 'a cat sitting on a kitchen stool yawns'. Find frequency of the letter 'c'

A:
2
****