TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'two people are riding on canoes down a river'. Find frequency of the letter 'e'

SOLUTION: 5

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

SOLUTION: 1

PROBLEM: Sentence: 'many different species of sheep in display at a museum'. Find frequency of the letter 'h'

SOLUTION:
1