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

[Q]: Sentence: 'a man holding a frisbee high into the air'. Find frequency of the letter 'a'
[A]: 4


[Q]: Sentence: 'the two dogs are playing in the pen together'. Find frequency of the letter 'o'
[A]: 3


[Q]: Sentence: 'two giraffes standing next to a building in an enclosure'. Find frequency of the letter 'i'
[A]:
5