TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'an audience watches as a bird spreads its wings'. Find frequency of the letter 'd'

SOLUTION: 3

PROBLEM: Sentence: 'a man with glasses adjusting his tie in a mirror'. Find frequency of the letter 's'

SOLUTION: 5

PROBLEM: Sentence: 'the kitchen area in this house is very nicely organized'. Find frequency of the letter 'n'

SOLUTION:
4