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: 'the meal is served and ready to be eaten'. Find frequency of the letter 'e'
[A]: 8


[Q]: Sentence: 'a man standing on top of a beach near a yellow umbrella'. Find frequency of the letter 'l'
[A]:
4