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 man standing on a tennis court holding a racquet'. Find frequency of the letter 's'

SOLUTION: 2

PROBLEM: Sentence: 'a laptop on top of a desk'. Find frequency of the letter 'e'

SOLUTION:
1