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

Input: Consider Input: Sentence: 'this is a sign in front of a large cathedral'. Find frequency of the letter 'a'

Output: 5


Input: Consider Input: Sentence: 'large grassy pasture filled with trees and a single horse'. Find frequency of the letter 'l'

Output: 4


Input: Consider Input: Sentence: 'a camping bag is lying on a cliff in a rocky place'. Find frequency of the letter 'c'


Output: 4