TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'cars parked outside if a retail store'. Find frequency of the letter 'd'

SOLUTION: 2

PROBLEM: Sentence: 'a man riding on the back of a white horse next to other horses'. Find frequency of the letter 'o'

SOLUTION: 6

PROBLEM: Sentence: 'an elephant with tusks is tied to a chain'. Find frequency of the letter 'c'

SOLUTION:
1