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

Sentence: 'a golden haired dog looking out of an open window'. Find frequency of the letter 'd'
4

Sentence: 'a picture of a toilet and toilet paper in a bathroom'. Find frequency of the letter 'o'
5

Sentence: 'a wood floored living room with connected dining room'. Find frequency of the letter 'm'

2