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

Input: Consider Input: Sentence: 'a person holding a wine glass in one hand and bread sticks in the other'. Find frequency of the letter 'd'

Output: 4

Input: Consider Input: Sentence: 'salad and vegetables with me on top of plate'. Find frequency of the letter 'o'

Output: 3

Input: Consider Input: Sentence: 'a pile of stones sitting on the side of a road with some signs above it'. Find frequency of the letter 'd'
Output: 2