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

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 sailboat is floating near the rocky shore of a beach'. Find frequency of the letter 'o'

Output: 5


Input: Consider Input: Sentence: 'someone is holding a wii control and moving the joystick'. Find frequency of the letter 'g'


Output: 2