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: 'decorated baseball cake in a clear plastic box'. Find frequency of the letter 'k'

Output: 1


Input: Consider Input: Sentence: 'older man getting ready to swing his bat at a ball on a stand in front of a group of viewers'. Find frequency of the letter 'n'


Output: 7