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

[EX Q]: Sentence: 'a couple of girls are hanging out at a restaurant'. Find frequency of the letter 'l'
[EX A]: 2

[EX Q]: Sentence: 'a bunch of people are standing out in a field a red one has their arms out as a white ball is in the air'. Find frequency of the letter 'e'
[EX A]: 9

[EX Q]: Sentence: 'a horse attempting to bite a zebra in a field'. Find frequency of the letter 'a'
[EX A]:
5