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

[Q]: Sentence: 'a baseball themed birthday cake is on a serving tray'. Find frequency of the letter 'g'
[A]: 1


[Q]: Sentence: 'a person trying to flip a skateboard in a garage'. Find frequency of the letter 'a'
[A]: 7


[Q]: Sentence: 'a man riding a wave on top of a surfboard in the ocean'. Find frequency of the letter 'e'
[A]:
3