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

[Q]: Sentence: 'a laptop computer with pictures of giraffes on the homescreen'. Find frequency of the letter 'o'
[A]: 5


[Q]: Sentence: 'three woman are having a discussion in the kitchen'. Find frequency of the letter 'n'
[A]: 5


[Q]: Sentence: 'a man throwing a suitcase out of an airplane in flight'. Find frequency of the letter 'a'
[A]:
7