TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'city two way street with cars lined up on both sides'. Find frequency of the letter 'h'

SOLUTION: 2

PROBLEM: Sentence: 'a tower with some bright lights and clocks on it'. Find frequency of the letter 'h'

SOLUTION: 3

PROBLEM: Sentence: 'a woman riding a horse in an equestrian event'. Find frequency of the letter 'e'

SOLUTION:
5