TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'three men in military suits are sitting on a bench,'. Find frequency of the letter 'a'

SOLUTION: 3

PROBLEM: Sentence: 'a woman fully dressed as a geisha'. Find frequency of the letter 'm'

SOLUTION: 1

PROBLEM: Sentence: 'a woman sitting in front of a piece of pizza'. Find frequency of the letter 'o'

SOLUTION:
4