TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a bathroom that has it's lights turned on'. Find frequency of the letter 'h'

SOLUTION: 4

PROBLEM: Sentence: 'a person is water skiing and there are birds flying around above them'. Find frequency of the letter 'n'

SOLUTION: 5

PROBLEM: Sentence: 'some very well dressed people posing with an umbrella'. Find frequency of the letter 'd'

SOLUTION:
2