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

[EX Q]: Sentence: 'a gourmet looking hamburger with fries on a dining table with some wine'. Find frequency of the letter 't'
[EX A]: 4

[EX Q]: Sentence: 'a closet with a fan, luggage and various boxes'. Find frequency of the letter 'a'
[EX A]: 6

[EX Q]: Sentence: 'a little boy playing in his yard with a baseball bat'. Find frequency of the letter 'i'
[EX A]:
5