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

Input: Consider Input: Sentence: 'a batter, catcher and umpire waiting for the pitch and a major league baseball game'. Find frequency of the letter 'c'

Output: 3


Input: Consider Input: Sentence: 'two young ladies that are dancing in the room together'. Find frequency of the letter 'a'

Output: 4


Input: Consider Input: Sentence: 'a large semi carrying a green tractor behind it on a flatbed trailer'. Find frequency of the letter 'n'


Output: 4