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 with headphones on is hunched over a sink while being recorded'. Find frequency of the letter 'd'

SOLUTION: 4

PROBLEM: Sentence: 'a little boy sitting on a bed in a bedroom'. Find frequency of the letter 'e'

SOLUTION: 3

PROBLEM: Sentence: 'two men engaged in a game of soccer on a grass field'. Find frequency of the letter 'a'

SOLUTION:
5