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

[EX Q]: Sentence: 'a picture of a toilet and toilet paper in a bathroom'. Find frequency of the letter 'o'
[EX A]: 5

[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: 'there is a woman that is standing on top of a white fire hyrdrant'. Find frequency of the letter 'i'
[EX A]:
5