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

[Q]: Sentence: 'the wooden kitchen has a small child's plastic table in it'. Find frequency of the letter 'n'
[A]: 3


[Q]: Sentence: 'a plane with smoke coming from the tips of both wings'. Find frequency of the letter 'c'
[A]: 1


[Q]: Sentence: 'a young person and an older person playing nintendo wii'. Find frequency of the letter 'a'
[A]:
4