TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a small white dog looking out a car window'. Find frequency of the letter 'l'

SOLUTION: 3

PROBLEM: Sentence: 'a man standing in front of a statue near a metal pole'. Find frequency of the letter 'f'

SOLUTION: 2

PROBLEM: Sentence: 'a close-up of a yellow truck with a crane on it'. Find frequency of the letter 't'

SOLUTION:
3