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

Input: Consider Input: Sentence: 'a cat sleeping near lots of pairs of shoes'. Find frequency of the letter 'r'

Output: 2


Input: Consider Input: Sentence: 'a herd of giraffe walking across a field'. Find frequency of the letter 'k'

Output: 1


Input: Consider Input: Sentence: 'a family drinking lots of wine with a bread basket'. Find frequency of the letter 'o'


Output: 2