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

Input: Consider Input: Sentence: 'a couple is cutting in to a cake at a wedding'. Find frequency of the letter 'd'

Output: 2


Input: Consider Input: Sentence: 'a man skating down a stair rail in front of a bunch of people'. Find frequency of the letter 'o'

Output: 5


Input: Consider Input: Sentence: 'a couple of people lying in a bed holding laptops'. Find frequency of the letter 'p'


Output: 5