TASK DEFINITION: In this task, you need to count the number of times the given letter appears in the given sentence.
PROBLEM: Sentence: 'a man hitting a tennis ball with a tennis racquet'. Find frequency of the letter 't'

SOLUTION: 6

PROBLEM: Sentence: 'a toilet of some sort near a sink of some sort'. Find frequency of the letter 'o'

SOLUTION: 7

PROBLEM: Sentence: 'a wood counter top in next to a fridge'. Find frequency of the letter 't'

SOLUTION:
4