TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a toilet sits in a cluttered bathroom next to a sink'. Find frequency of the letter 'a'

SOLUTION: 4

PROBLEM: Sentence: 'a person on a sidewalk jumping with an umbrella'. Find frequency of the letter 'a'

SOLUTION: 5

PROBLEM: Sentence: 'a person holding a wine glass in one hand and bread sticks in the other'. Find frequency of the letter 'd'

SOLUTION:
4