TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a photo of a couple of people at a convention'. Find frequency of the letter 'v'

SOLUTION: 1

PROBLEM: Sentence: 'a white police vehicle parked on a paved street'. Find frequency of the letter 'a'

SOLUTION: 4

PROBLEM: Sentence: 'a view of a street corner with an umbrella on it'. Find frequency of the letter 't'

SOLUTION:
4