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

[Q]: Sentence: 'a man sitting in front of a laptop computer next to a child'. Find frequency of the letter 'e'
[A]: 2


[Q]: Sentence: 'a blue tripocal bird is perched on a wooden fence'. Find frequency of the letter 'd'
[A]: 3


[Q]: Sentence: 'the woman is wearing a dress holding a pair of scissors'. Find frequency of the letter 's'
[A]:
7