TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'man riding a skate board down the little board way'. Find frequency of the letter 'k'

SOLUTION: 1

PROBLEM: Sentence: 'group of cars on the road with the sun setting behind it'. Find frequency of the letter 'd'

SOLUTION: 2

PROBLEM: Sentence: 'cars stopped at an intersection on a dark night'. Find frequency of the letter 'o'

SOLUTION:
3