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

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

[EX Q]: Sentence: 'three young people goofing around; one of the guys has a football, the girl has a teddy bear'. Find frequency of the letter 'd'
[EX A]: 3

[EX Q]: Sentence: 'a woman in a brown coat this is holding a phone'. Find frequency of the letter 'w'
[EX A]:
2