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

Input: Consider Input: Sentence: 'a chair and umbrella on a sandy beach'. Find frequency of the letter 's'

Output: 1


Input: Consider Input: Sentence: 'two men sitting quietly on a park bench'. Find frequency of the letter 'a'

Output: 2


Input: Consider Input: Sentence: 'a woman has a horse and a dog both on leashes'. Find frequency of the letter 'h'


Output: 4