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

[Q]: Sentence: 'a group of three dogs laying on a kitchen floor'. Find frequency of the letter 'r'
[A]: 3


[Q]: Sentence: 'a white bowl filled with peeled orange slices'. Find frequency of the letter 's'
[A]: 2


[Q]: Sentence: 'several business signs and utility wires and poles'. Find frequency of the letter 'g'
[A]:
1