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

[Q]: Sentence: 'apples, pears, and oranges are piled up for sale'. Find frequency of the letter 'a'
[A]: 6


[Q]: Sentence: 'a man with a large grey and black beard and glasses and a tie'. Find frequency of the letter 'e'
[A]: 5


[Q]: Sentence: 'a young man sitting on the beach with a surf board'. Find frequency of the letter 't'
[A]:
4