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

Input: Consider Input: Sentence: 'person wearing all white leaned up against a wall with a yellow sign'. Find frequency of the letter 'a'

Output: 8


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: 'grown men playing an indoor soccer game on turf'. Find frequency of the letter 'e'


Output: 3