TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'an orange cat sitting on the ground next to a  purse'. Find frequency of the letter 's'

SOLUTION: 2

PROBLEM: Sentence: 'a very big nice looking living room with nice furnishings'. Find frequency of the letter 'e'

SOLUTION: 3

PROBLEM: Sentence: 'a group of young men playing a game of frisbee'. Find frequency of the letter 'b'

SOLUTION:
1