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

[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: 'a young man riding a skateboard near a forest'. Find frequency of the letter 'd'
[EX A]: 2

[EX Q]: Sentence: 'a punch of different shots of a man in the air'. Find frequency of the letter 'h'
[EX A]:
3