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

Input: Consider Input: Sentence: 'a half eaten doughnut in a persons hand'. Find frequency of the letter 'h'

Output: 3


Input: Consider Input: Sentence: 'a toilet of some sort near a sink of some sort'. Find frequency of the letter 'o'

Output: 7


Input: Consider Input: Sentence: 'a woman sitting on a bench holding a kite of a bat'. Find frequency of the letter 'n'


Output: 5