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

[Q]: Sentence: 'an airplane is being towed away from the jet bridge'. Find frequency of the letter 's'
[A]: 1


[Q]: Sentence: 'there is a sandwich with a lot of meat cut in half'. Find frequency of the letter 'a'
[A]: 5


[Q]: Sentence: 'stuffed toy bears with year markers beneath them on display'. Find frequency of the letter 't'
[A]:
5