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

[Q]: Sentence: 'party cakes in plastic containers, with a cake with a plastic santa claus and reindeer on top'. Find frequency of the letter 's'
[A]: 6


[Q]: Sentence: 'the two dogs are playing in the pen together'. Find frequency of the letter 'o'
[A]: 3


[Q]: Sentence: 'a combination pizza sitting on a table on a piece of wax paper'. Find frequency of the letter 'p'
[A]:
4