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

Sentence: 'a toilet filled with a brown liner and dirty water'. Find frequency of the letter 't'
5

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

Sentence: 'a man eating at a table with near empty plats and condiments'. Find frequency of the letter 'c'

1