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

[EX Q]: Sentence: 'the skateboarder has on red and black sneakers and is riding a skateboard'. Find frequency of the letter 'g'
[EX A]: 1

[EX Q]: Sentence: 'two young ladies that are dancing in the room together'. Find frequency of the letter 'a'
[EX A]: 4

[EX Q]: Sentence: 'small airplane in the process of taking off'. Find frequency of the letter 'e'
[EX A]:
3