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

[Q]: Sentence: 'a plastic tray that has different foods inside of it'. Find frequency of the letter 't'
[A]: 6


[Q]: Sentence: 'small black bird with red on its head standing on a tree branch'. Find frequency of the letter 'b'
[A]: 3


[Q]: Sentence: 'a man holing a doughnut box open with a female standing beside him'. Find frequency of the letter 'g'
[A]:
3