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

[Q]: Sentence: 'a bunch of green bananas is hanging on a tree'. Find frequency of the letter 'n'
[A]: 7


[Q]: Sentence: 'a bathroom with a sink, counter top, and mirror is shown'. Find frequency of the letter 'i'
[A]: 4


[Q]: Sentence: 'a man on the stage raising his glass to people'. Find frequency of the letter 'g'
[A]:
3