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 filled with a brown liner and dirty water'. Find frequency of the letter 't'

SOLUTION: 5

PROBLEM: Sentence: 'a boy that is sitting at a table with pizza'. Find frequency of the letter 's'

SOLUTION: 2

PROBLEM: Sentence: 'a living room with a television and brown couch has a clothes hanger on the doorknob'. Find frequency of the letter 'w'

SOLUTION:
2