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

[Q]: Sentence: 'a knife a cutting board some bananas and a toaster'. Find frequency of the letter 'i'
[A]: 2


[Q]: Sentence: 'a traffic signal by a wire filled with some birds'. Find frequency of the letter 'e'
[A]: 3


[Q]: Sentence: 'a couple of giraffes next to a brick wall'. Find frequency of the letter 'i'
[A]:
2