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

[Q]: Sentence: 'a little boy standing near a couch and a table'. Find frequency of the letter 'i'
[A]: 2


[Q]: Sentence: 'a bathroom that has it's lights turned on'. Find frequency of the letter 'h'
[A]: 4


[Q]: Sentence: 'a baseball player swings a bat at a ball during a game'. Find frequency of the letter 's'
[A]:
3