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

[Q]: Sentence: 'a sailboat is floating near the rocky shore of a beach'. Find frequency of the letter 'o'
[A]: 5


[Q]: Sentence: 'soccer players on opposite teams fight for control over a ball'. Find frequency of the letter 't'
[A]: 4


[Q]: Sentence: 'a little boy and a little girl laying on a cat shaped beany bed'. Find frequency of the letter 'l'
[A]:
6