TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a tv in a glass mirror in the bathroom'. Find frequency of the letter 'h'

SOLUTION: 2

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

SOLUTION: 2

PROBLEM: Sentence: 'a plate holding and pizza made from a tortilla'. Find frequency of the letter 'e'

SOLUTION:
2