TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a man playing baseball on a television set'. Find frequency of the letter 'l'

SOLUTION: 4

PROBLEM: Sentence: 'hotel towels with sunglasses perched and hotel business cards and catalog'. Find frequency of the letter 'o'

SOLUTION: 4

PROBLEM: Sentence: 'a zebra and a young deer grazing in the grass together'. Find frequency of the letter 't'

SOLUTION:
3