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

[Q]: Sentence: 'a wedding cake with pink roses on a silver plate'. Find frequency of the letter 'a'
[A]: 4


[Q]: Sentence: 'a dog is shown sitting on rocks by the beach'. Find frequency of the letter 'a'
[A]: 2


[Q]: Sentence: 'a line of people on motorcycles on the road'. Find frequency of the letter 'e'
[A]:
5