TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a blue fire hydrant painted on the bottom of it'. Find frequency of the letter 'h'

SOLUTION: 2

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: 'giraffes are eating and drinking in a big pen'. Find frequency of the letter 'f'

SOLUTION:
2