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

Input: Consider Input: Sentence: 'a stuffed animal sitting on an empty bed'. Find frequency of the letter 'u'

Output: 1


Input: Consider Input: Sentence: 'two people and two children walking in a building'. Find frequency of the letter 'd'

Output: 3


Input: Consider Input: Sentence: 'a kid eats a sandwich on a picnic bench'. Find frequency of the letter 'e'


Output: 2