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

[Q]: Sentence: 'a very big nice looking living room with nice furnishings'. Find frequency of the letter 'e'
[A]: 3


[Q]: Sentence: 'a bed with a mattress that has nothing on it'. Find frequency of the letter 'a'
[A]: 5


[Q]: Sentence: 'a kitchen with many papers stuck on the refrigerator'. Find frequency of the letter 'c'
[A]:
2