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

Input: Consider Input: Sentence: 'a black animal in dirt area below trees and rocks'. Find frequency of the letter 'n'

Output: 3


Input: Consider Input: Sentence: 'two giraffes, one standing and one laying down'. Find frequency of the letter 'g'

Output: 3


Input: Consider Input: Sentence: 'a man is standing next to a large truck'. Find frequency of the letter 'e'


Output: 2