TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a bunch of green bananas is hanging on a tree'. Find frequency of the letter 'n'

SOLUTION: 7

PROBLEM: Sentence: 'a airplane view of a big factory some people and cars'. Find frequency of the letter 'f'

SOLUTION: 2

PROBLEM: Sentence: 'a guy with glasses shows off his wii remote'. Find frequency of the letter 'h'

SOLUTION:
3