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

[Q]: Sentence: 'a cat sprawls out and sleeps on its back on a lounge chair with an acorn theme'. Find frequency of the letter 'r'
[A]: 3


[Q]: Sentence: 'a large motorcycle that has a man dressed in old clothing next to it'. Find frequency of the letter 'a'
[A]: 6


[Q]: Sentence: 'the woman is posing for a photo with her skis'. Find frequency of the letter 't'
[A]:
3