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

[Q]: Sentence: 'group of cars on the road with the sun setting behind it'. Find frequency of the letter 'd'
[A]: 2


[Q]: Sentence: 'children with scissors and construction paper in a school classroom'. Find frequency of the letter 'c'
[A]: 6


[Q]: Sentence: 'this yellow fire hydrant sits in a grass field'. Find frequency of the letter 'i'
[A]:
5