TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a child sitting a table with a pizza in front of him'. Find frequency of the letter 'h'

SOLUTION: 3

PROBLEM: Sentence: 'a plane with smoke coming from the tips of both wings'. Find frequency of the letter 'c'

SOLUTION: 1

PROBLEM: Sentence: 'a passenger plane that is flying in the sky'. Find frequency of the letter 's'

SOLUTION:
4