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

Input: Consider Input: Sentence: 'a stop sign near a rail road crossing sign'. Find frequency of the letter 'g'

Output: 3


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: 'man cutting through a cake in front of a group of people'. Find frequency of the letter 'u'


Output: 3