TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a group of three dogs laying on a kitchen floor'. Find frequency of the letter 'r'

SOLUTION: 3

PROBLEM: Sentence: 'a white and blue plate topped with meat and a salad'. Find frequency of the letter 'u'

SOLUTION: 1

PROBLEM: Sentence: 'a group of men who are looking at a man's cell phone'. Find frequency of the letter 'n'

SOLUTION:
4