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: 'a variety of a different type of vegetables'. Find frequency of the letter 't'
[A]: 4


[Q]: Sentence: 'a white and red bus parked outside a building'. Find frequency of the letter 't'
[A]:
2