TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a street scene looking at the back of the stop sign'. Find frequency of the letter 't'

SOLUTION: 6

PROBLEM: Sentence: 'one man grabbing another at a table while laughing'. Find frequency of the letter 'n'

SOLUTION: 5

PROBLEM: Sentence: 'hundred of motor cycles all lined up on a street'. Find frequency of the letter 'n'

SOLUTION:
3