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

[Q]: Sentence: 'bananas are being dried in a tropical setting'. Find frequency of the letter 'i'
[A]: 5

[Q]: Sentence: 'a group of people stand inside of a big room'. Find frequency of the letter 'o'
[A]: 6

[Q]: Sentence: 'a dog has found a rather large stick for playing fetch'. Find frequency of the letter 't'
[A]:
3