TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'two giraffes, one standing and one laying down'. Find frequency of the letter 'g'

SOLUTION: 3

PROBLEM: Sentence: 'a small wrinkley dog wearing a bow tie'. Find frequency of the letter 'e'

SOLUTION: 3

PROBLEM: Sentence: 'a baby sheep feeding on a adult sheep in a field'. Find frequency of the letter 'a'

SOLUTION:
5