TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a girl hitting a tennis ball on a court'. Find frequency of the letter 'l'

SOLUTION: 3

PROBLEM: Sentence: 'a woman throwing a frisbee on a field'. Find frequency of the letter 's'

SOLUTION: 1

PROBLEM: Sentence: 'a boy is tilting his skateboard up at the top of a skateboard ramp'. Find frequency of the letter 'o'

SOLUTION:
5