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

[Q]: Sentence: 'a few men walking through a market place'. Find frequency of the letter 'f'
[A]: 1

[Q]: Sentence: 'two elephants walking on cement next to wall'. Find frequency of the letter 'n'
[A]: 5

[Q]: Sentence: 'two people flying large kites on the beach'. Find frequency of the letter 'e'
[A]:
6