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

Input: Consider Input: Sentence: 'a man is taking a picture of a man and woman'. Find frequency of the letter 'a'

Output: 8


Input: Consider Input: Sentence: 'a cooked pizza on a silver platter with another in the background'. Find frequency of the letter 'e'

Output: 5


Input: Consider Input: Sentence: 'a jet flying through the clear blue sky'. Find frequency of the letter 'g'


Output: 2