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

Input: Consider Input: Sentence: 'a pizza pie sitting on a wooden table with tongs'. Find frequency of the letter 't'

Output: 5


Input: Consider Input: Sentence: 'small black bird with red on its head standing on a tree branch'. Find frequency of the letter 'b'

Output: 3


Input: Consider Input: Sentence: 'two sonic care tooth brushes knocked over on a counter'. Find frequency of the letter 'd'


Output: 1