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 giraffe sticking it's tongue out near a window'. Find frequency of the letter 'a'

SOLUTION: 4

PROBLEM: Sentence: 'a cupcake with a face on it on a pan'. Find frequency of the letter 'n'

SOLUTION:
3