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: 'young girl playing with refrigerator magnet while kneeling on floor'. Find frequency of the letter 'n'

SOLUTION: 6

PROBLEM: Sentence: 'two laptops sitting on a desk next to some pens and pencils next to a chair'. Find frequency of the letter 's'

SOLUTION:
6