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

[EX Q]: Sentence: 'a truck with a camper sits parked in some vegetation'. Find frequency of the letter 's'
[EX A]: 3

[EX Q]: Sentence: 'a man and several white red and blue airplanes'. Find frequency of the letter 'u'
[EX A]: 1

[EX Q]: Sentence: 'a young man holding a skateboard while wearing a hat'. Find frequency of the letter 'g'
[EX A]:
3