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

Sentence: 'the miniature, elaborate exhibit depicts an ancient boating scene'. Find frequency of the letter 'n'
6

Sentence: 'a man in a black shirt prepares to catch a frisbee'. Find frequency of the letter 'f'
1

Sentence: 'a child sitting at a table smiling with its eyes closed '. Find frequency of the letter 'n'

2