TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a little boy that has a toothbrush in his mouth'. Find frequency of the letter 'r'

SOLUTION: 1

PROBLEM: Sentence: 'a man riding a skateboard up the side of a ramp'. Find frequency of the letter 'u'

SOLUTION: 1

PROBLEM: Sentence: 'a person is cutting broccoli on a board'. Find frequency of the letter 'n'

SOLUTION:
3