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

[EX Q]: Sentence: 'three young children playing with a ball in front of a huge bridge'. Find frequency of the letter 'e'
[EX A]: 5

[EX Q]: Sentence: 'a man serving himself pizza in a wooden booth'. Find frequency of the letter 'n'
[EX A]: 4

[EX Q]: Sentence: 'a woman holding an umbrella walks along a city sidewalk'. Find frequency of the letter 'w'
[EX A]:
3