TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'pedestrian in stripe clothing standing on street corner'. Find frequency of the letter 's'

SOLUTION: 4

PROBLEM: Sentence: 'a few men walking through a market place'. Find frequency of the letter 'f'

SOLUTION: 1

PROBLEM: Sentence: 'a person is looking at a baby with a breathing apparatus'. Find frequency of the letter 'y'

SOLUTION:
1