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

[Q]: Sentence: 'a teenager witting on a futon couch holding gaming controls in both hands'. Find frequency of the letter 'c'
[A]: 3

[Q]: Sentence: 'a woman is looking at sheep off in a field'. Find frequency of the letter 'm'
[A]: 1

[Q]: Sentence: 'a meal in a container consisting of an orange, meatballs, carrots, and peas'. Find frequency of the letter 'n'
[A]:
8