TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a ready to eat pizza on a rack'. Find frequency of the letter 'r'

SOLUTION: 2

PROBLEM: Sentence: 'two people holding their skies in a snowy resort'. Find frequency of the letter 'n'

SOLUTION: 3

PROBLEM: Sentence: 'several snow skiers at the top of a snowy mountain'. Find frequency of the letter 'n'

SOLUTION:
4