TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a crowd of people skiing and enjoying the snow'. Find frequency of the letter 'o'

SOLUTION: 5

PROBLEM: Sentence: 'tow birds flying by a long necked crane'. Find frequency of the letter 'f'

SOLUTION: 1

PROBLEM: Sentence: 'several elephants being led with riding benches on their backs'. Find frequency of the letter 'e'

SOLUTION:
9