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

Input: Consider Input: Sentence: 'children with scissors and construction paper in a school classroom'. Find frequency of the letter 'c'

Output: 6


Input: Consider Input: Sentence: 'a wedding cake with pink roses on a silver plate'. Find frequency of the letter 'a'

Output: 4


Input: Consider Input: Sentence: 'two people riding on bicycles near a row of trees'. Find frequency of the letter 'a'


Output: 2