TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a golden haired dog looking out of an open window'. Find frequency of the letter 'd'

SOLUTION: 4

PROBLEM: Sentence: 'the miniature, elaborate exhibit depicts an ancient boating scene'. Find frequency of the letter 'n'

SOLUTION: 6

PROBLEM: Sentence: 'a woman sitting on a suitcase with a little dog looking at her'. Find frequency of the letter 'a'

SOLUTION:
6