TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a woman swinging a tennis racquet towards a tennis ball'. Find frequency of the letter 'e'

SOLUTION: 3

PROBLEM: Sentence: 'a man in his car eating a donut'. Find frequency of the letter 'm'

SOLUTION: 1

PROBLEM: Sentence: 'a person that is shaving in animal on the ground'. Find frequency of the letter 'r'

SOLUTION:
2