TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'food sitting in bowls on table with checked tablecloth'. Find frequency of the letter 't'

SOLUTION: 6

PROBLEM: Sentence: 'two people and two children walking in a building'. Find frequency of the letter 'd'

SOLUTION: 3

PROBLEM: Sentence: 'the toilet seat is up, but the bathroom appears pretty clean'. Find frequency of the letter 'b'

SOLUTION:
2