TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'group of snowboarders on a snowy trail overlooking a mountain'. Find frequency of the letter 'r'

SOLUTION: 5

PROBLEM: Sentence: 'a notebook and pen are left on a park bench'. Find frequency of the letter 'e'

SOLUTION: 5

PROBLEM: Sentence: 'a chef removes the peel from an orange'. Find frequency of the letter 'l'

SOLUTION:
1