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

Q: Sentence: 'a couple of people that are on a baseball field'. Find frequency of the letter 'c'

A: 1
****
Q: Sentence: 'a black bear sitting in the grass taking a rest'. Find frequency of the letter 'a'

A: 6
****
Q: Sentence: 'a motocross rider doing a trick while in the air'. Find frequency of the letter 'l'

A:
1
****