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

Input: Consider Input: Sentence: 'party cakes in plastic containers, with a cake with a plastic santa claus and reindeer on top'. Find frequency of the letter 's'

Output: 6


Input: Consider Input: Sentence: 'group of snowboarders on a snowy trail overlooking a mountain'. Find frequency of the letter 'r'

Output: 5


Input: Consider Input: Sentence: 'panorama of a field with cows next to a dirt road'. Find frequency of the letter 'd'


Output: 3