TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'the sun goes down over a bike tied to a bench at the beach'. Find frequency of the letter 't'

SOLUTION: 5

PROBLEM: Sentence: 'a few giraffes standing in a field looking around'. Find frequency of the letter 'e'

SOLUTION: 3

PROBLEM: Sentence: 'a very large group of people on the beach'. Find frequency of the letter 'r'

SOLUTION:
3