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

Input: Consider Input: Sentence: 'a man sitting on a motorcycle near two other men'. Find frequency of the letter 'r'

Output: 3


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: 'baseball game with umpire, catcher, and batter at home base'. Find frequency of the letter 'c'


Output: 2