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

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

Output: 6


Input: Consider Input: Sentence: 'a couple of items that are on the wall'. Find frequency of the letter 'm'

Output: 1


Input: Consider Input: Sentence: 'a graffiti covered bus in a fenced in parking lot'. Find frequency of the letter 'c'


Output: 2