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: 'flower in a vase full of water sitting on a stand '. Find frequency of the letter 'l'

SOLUTION: 3

PROBLEM: Sentence: 'an airplane sits on the tarmac at an airport'. Find frequency of the letter 't'

SOLUTION:
5