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

[EX Q]: Sentence: 'a small white plane sitting on top of the ocean'. Find frequency of the letter 'e'
[EX A]: 4

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

[EX Q]: Sentence: 'a plate with eggs, bacon, fruit and toast on a wooden table'. Find frequency of the letter 'o'
[EX A]:
5