TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a laptop computer with pictures of giraffes on the homescreen'. Find frequency of the letter 'o'

SOLUTION: 5

PROBLEM: Sentence: 'a woman holds some baked goods at the convention'. Find frequency of the letter 'd'

SOLUTION: 3

PROBLEM: Sentence: 'a cat lays next to the keyboard of a laptop'. Find frequency of the letter 'a'

SOLUTION:
6