TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a red stop sign with street signs above it'. Find frequency of the letter 't'

SOLUTION: 5

PROBLEM: Sentence: 'a room with a big screen television and a couch'. Find frequency of the letter 'h'

SOLUTION: 2

PROBLEM: Sentence: 'a man in a black outfit sleeping on a small bench'. Find frequency of the letter 'h'

SOLUTION:
1