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

Sentence: 'a toilet sits in a cluttered bathroom next to a sink'. Find frequency of the letter 'a'
4

Sentence: 'the meal is served and ready to be eaten'. Find frequency of the letter 'e'
8

Sentence: 'packed luggage ready to go somewhere and in a room'. Find frequency of the letter 'c'
1