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

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


[Q]: Sentence: 'two indian women in colorful garb standing barefoot with two indian men'. Find frequency of the letter 'd'
[A]: 3


[Q]: Sentence: 'a man riding a surfboard on a wave in the ocean'. Find frequency of the letter 'r'
[A]:
3