TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a grapefruit, toast, coffee and other items are on a tray'. Find frequency of the letter 't'

SOLUTION: 6

PROBLEM: Sentence: 'baseball player reaching back as he's about to throw the ball'. Find frequency of the letter 'e'

SOLUTION: 5

PROBLEM: Sentence: 'two hipsters standing with their backs against each other'. Find frequency of the letter 'o'

SOLUTION:
2