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 a white surfboard on a large wave'. Find frequency of the letter 'a'

SOLUTION: 7

PROBLEM: Sentence: 'a girl playing with a frisbee while people watch'. Find frequency of the letter 'e'

SOLUTION: 5

PROBLEM: Sentence: 'packed luggage ready to go somewhere and in a room'. Find frequency of the letter 'c'

SOLUTION:
1