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

Sentence: 'a close up of a train on a track in the dark'. Find frequency of the letter 'a'
6

Sentence: 'the ingredients are ready on the wooden table'. Find frequency of the letter 'w'
1

Sentence: 'a living room full of old people sitting around a coffee table'. Find frequency of the letter 'f'
4