In this task, you need to count the number of times the given letter appears in the given sentence.

[EX Q]: Sentence: 'a parking meter painted green with a sign that describes it as not a parking meter'. Find frequency of the letter 's'
[EX A]: 4

[EX Q]: Sentence: 'town clocks affixed to a tall, brick building'. Find frequency of the letter 'r'
[EX A]: 1

[EX Q]: Sentence: 'flat bread pizza slices piled on top of each other'. Find frequency of the letter 't'
[EX A]:
3