TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
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: 'a family sitting at a table in a restaurant looking at their phones'. Find frequency of the letter 't'

SOLUTION: 8

PROBLEM: Sentence: 'a train traveling down tracks next to a forest'. Find frequency of the letter 't'

SOLUTION:
6