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 train going over a bridge with some buildings in the background'. Find frequency of the letter 'd'

SOLUTION: 3

PROBLEM: Sentence: 'an aerial view of living room couch, chairs and coffee table'. Find frequency of the letter 't'

SOLUTION:
1