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 hitting a tennis ball with a tennis racquet'. Find frequency of the letter 't'

SOLUTION: 6

PROBLEM: Sentence: 'a  woman standing next to a man on a motorcycle in front of a market'. Find frequency of the letter 'l'

SOLUTION: 1

PROBLEM: Sentence: 'a black cat drinking water fron the sink faucet'. Find frequency of the letter 'c'

SOLUTION:
3