TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a blue fire hydrant painted on the bottom of it'. Find frequency of the letter 'h'

SOLUTION: 2

PROBLEM: Sentence: 'a bunch of fruit sitting in a bowl, its overflowing'. Find frequency of the letter 't'

SOLUTION: 4

PROBLEM: Sentence: 'chefs in uniform prepare food in a commercial kitchen'. Find frequency of the letter 'a'

SOLUTION:
3