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

[EX Q]: Sentence: 'a tall building with antenna stands before a jet flying in the background'. Find frequency of the letter 't'
[EX A]: 6

[EX Q]: Sentence: 'a young girl skiing down a snowy mountain'. Find frequency of the letter 'l'
[EX A]: 1

[EX Q]: Sentence: 'a bird is sitting on a branch in front of a palm type tree'. Find frequency of the letter 'i'
[EX A]:
5