TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a piece of meat covered in ketchup next to a hamburger on a green plate'. Find frequency of the letter 'g'

SOLUTION: 2

PROBLEM: Sentence: 'a woman is taking a sip of a drink from a glass'. Find frequency of the letter 'i'

SOLUTION: 4

PROBLEM: Sentence: 'a toy doll comes complete with a couple of outfits to wear'. Find frequency of the letter 'a'

SOLUTION:
3