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

[Q]: Sentence: 'old double decker bus parked in a lot'. Find frequency of the letter 't'
[A]: 1


[Q]: Sentence: 'a crowd of people skiing and enjoying the snow'. Find frequency of the letter 'o'
[A]: 5


[Q]: Sentence: 'some birds are standing on a bird feeder and having fun'. Find frequency of the letter 'e'
[A]:
5