TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a man sitting in front of a laptop computer next to a child'. Find frequency of the letter 'e'

SOLUTION: 2

PROBLEM: Sentence: 'the miniature, elaborate exhibit depicts an ancient boating scene'. Find frequency of the letter 'n'

SOLUTION: 6

PROBLEM: Sentence: 'people watch as others standing playing tennis on the wii'. Find frequency of the letter 'i'

SOLUTION:
5