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

Q: Sentence: 'a boy that is sitting at a table with pizza'. Find frequency of the letter 's'

A: 2
****
Q: Sentence: 'a couple of people that are on a baseball field'. Find frequency of the letter 'c'

A: 1
****
Q: Sentence: 'a small boy in military costume sitting on a horse'. Find frequency of the letter 'o'

A:
4
****