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

[Q]: Sentence: 'a jet that is flying in the sky with a banner behind it'. Find frequency of the letter 'r'
[A]: 1


[Q]: Sentence: 'two bigger elephants standing with a small elephant'. Find frequency of the letter 't'
[A]: 5


[Q]: Sentence: 'a woman is holding two parrots in her hands'. Find frequency of the letter 'o'
[A]:
4