TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a person is performing a stunt on a snowboard'. Find frequency of the letter 'p'

SOLUTION: 2

PROBLEM: Sentence: 'a yellow fire hydrant in the forefront of a roadway'. Find frequency of the letter 'r'

SOLUTION: 5

PROBLEM: Sentence: 'an open fridge full of various food items'. Find frequency of the letter 'l'

SOLUTION:
2