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

[Q]: Sentence: 'two laptop computers sitting on top of a white table'. Find frequency of the letter 'f'
[A]: 1


[Q]: Sentence: 'a bowl of vegetables in a soup like substance next to a spoon'. Find frequency of the letter 'a'
[A]: 5


[Q]: Sentence: 'a subway train decorated with a christmas theme'. Find frequency of the letter 't'
[A]:
5