TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'young girl playing with refrigerator magnet while kneeling on floor'. Find frequency of the letter 'n'

SOLUTION: 6

PROBLEM: Sentence: 'the ingredients are ready on the wooden table'. Find frequency of the letter 'w'

SOLUTION: 1

PROBLEM: Sentence: 'a red two level bus that is parked with it's doors closed and another bus is behind it'. Find frequency of the letter 'e'

SOLUTION:
7