TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'man in air skateboarding on street with building'. Find frequency of the letter 't'

SOLUTION: 4

PROBLEM: Sentence: 'a bowl of granola, dried fruit, and bananas'. Find frequency of the letter 'u'

SOLUTION: 1

PROBLEM: Sentence: 'a person riding a skate board on a city street'. Find frequency of the letter 'a'

SOLUTION:
5