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

[Q]: Sentence: 'a baby calf has a tag on its right ear'. Find frequency of the letter 'n'
[A]: 1


[Q]: Sentence: 'a man skating down a stair rail in front of a bunch of people'. Find frequency of the letter 'o'
[A]: 5


[Q]: Sentence: 'suitcase with clothing lying on carpeted floor indoors'. Find frequency of the letter 'a'
[A]:
2