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: 'a glass a rope and a pair of scissors'. Find frequency of the letter 's'
[A]: 6


[Q]: Sentence: 'two men in black wet suits beside a white surfboard'. Find frequency of the letter 'e'
[A]:
5