TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'the receipts from a meal at a restaurant are for a sandwich, chili, and apple'. Find frequency of the letter 'u'

SOLUTION: 1

PROBLEM: Sentence: 'a man walking a large elephant down a dirt road'. Find frequency of the letter 'g'

SOLUTION: 2

PROBLEM: Sentence: 'a little boy holding a blue kite while standing in a lush green field'. Find frequency of the letter 'e'

SOLUTION:
7