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 lady mixes some things in a blender as people look on'. Find frequency of the letter 'i'
[EX A]: 3

[EX Q]: Sentence: 'a boy swinging his baseball bat with a catcher and umpire behind him'. Find frequency of the letter 'a'
[EX A]:
7