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

SOLUTION: 3

PROBLEM: Sentence: 'a woman standing on a peer overlooking the river'. Find frequency of the letter 'g'

SOLUTION:
2