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

[EX Q]: Sentence: 'a woman in a tank top reaches out for a frisbee'. Find frequency of the letter 'a'
[EX A]: 6

[EX Q]: Sentence: 'a man with glasses adjusting his tie in a mirror'. Find frequency of the letter 's'
[EX A]: 5

[EX Q]: Sentence: 'a woman standing in front of a bathroom sink in front of a mirror'. Find frequency of the letter 'o'
[EX A]:
8