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

[Q]: Sentence: 'supplies and tools are arranged on the floor with a hard hat and bag'. Find frequency of the letter 'n'
[A]: 4


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


[Q]: Sentence: 'a toasted sub sandwich is next to a salad'. Find frequency of the letter 'a'
[A]:
6