TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'food sitting in bowls on table with checked tablecloth'. Find frequency of the letter 't'

SOLUTION: 6

PROBLEM: Sentence: 'two people under an umbrella while walking down a sidewalk'. Find frequency of the letter 'i'

SOLUTION: 3

PROBLEM: Sentence: 'a woman sits in an antique style suitcase'. Find frequency of the letter 'a'

SOLUTION:
5