TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'flower in a vase full of water sitting on a stand '. Find frequency of the letter 'l'

SOLUTION: 3

PROBLEM: Sentence: 'a glass a rope and a pair of scissors'. Find frequency of the letter 's'

SOLUTION: 6

PROBLEM: Sentence: 'a man in a suit looks over his shoulder'. Find frequency of the letter 'a'

SOLUTION:
3