TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'eight donuts are cooked together in oil in a metal tray'. Find frequency of the letter 'h'

SOLUTION: 2

PROBLEM: Sentence: 'a large motorcycle that has a man dressed in old clothing next to it'. Find frequency of the letter 'a'

SOLUTION: 6

PROBLEM: Sentence: 'children looking at a horse pulling people in uniforms'. Find frequency of the letter 's'

SOLUTION:
2