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 brown paper bag kite'. Find frequency of the letter 'b'
[A]: 2


[Q]: Sentence: 'slices of orange are arranged on a plate'. Find frequency of the letter 's'
[A]: 2


[Q]: Sentence: 'there is a make surfer riding a wave at the beach'. Find frequency of the letter 'a'
[A]:
6