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 table topped with a cupcake on a picture of a cupcake'. Find frequency of the letter 'o'
[EX A]: 3

[EX Q]: Sentence: 'two plates with neatly assorted meats and vegetables'. Find frequency of the letter 'e'
[EX A]:
7