TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a gourmet looking hamburger with fries on a dining table with some wine'. Find frequency of the letter 't'

SOLUTION: 4

PROBLEM: Sentence: 'two men with colorful ties are posing for a picture'. Find frequency of the letter 'r'

SOLUTION: 4

PROBLEM: Sentence: 'someone is trying to pull of a skateboard trick'. Find frequency of the letter 'l'

SOLUTION:
2