TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'three young children playing with a ball in front of a huge bridge'. Find frequency of the letter 'e'

SOLUTION: 5

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

SOLUTION: 2

PROBLEM: Sentence: 'a man walking along a beach holding a surfboard'. Find frequency of the letter 'w'

SOLUTION:
1