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

Input: Consider Input: Sentence: 'a small dog sits in the rear window of a car'. Find frequency of the letter 'm'

Output: 1


Input: Consider Input: Sentence: 'young boy flying kite in large field at outdoor event'. Find frequency of the letter 'y'

Output: 3


Input: Consider Input: Sentence: 'a man holding a baseball bat an playing baseball'. Find frequency of the letter 'l'


Output: 6