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

Input: Consider Input: Sentence: 'a player swings his bat at a baseball game'. Find frequency of the letter 'p'

Output: 1


Input: Consider Input: Sentence: 'a person standing operating a cell phone in a room'. Find frequency of the letter 'n'

Output: 6


Input: Consider Input: Sentence: 'a baseball player about to hit the ball'. Find frequency of the letter 'h'


Output: 2