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

Input: Consider Input: Sentence: 'the interior of a living and dining room'. Find frequency of the letter 'i'

Output: 6


Input: Consider Input: Sentence: 'cars parked outside if a retail store'. Find frequency of the letter 'd'

Output: 2


Input: Consider Input: Sentence: 'a cat standing above a pair of brown shoes'. Find frequency of the letter 'b'


Output: 2