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

Input: Consider Input: Sentence: 'a cat sprawls out and sleeps on its back on a lounge chair with an acorn theme'. Find frequency of the letter 'r'

Output: 3


Input: Consider Input: Sentence: 'a young boy holding a piece of paper on top of a table'. Find frequency of the letter 'y'

Output: 2


Input: Consider Input: Sentence: 'two kids are smiling at each other at the dining table'. Find frequency of the letter 'g'


Output: 2