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

Input: Consider Input: Sentence: 'a plate of food, with broccoli and nuts'. Find frequency of the letter 'b'

Output: 1


Input: Consider Input: Sentence: 'a plastic container next to a toilet on a wooden box'. Find frequency of the letter 'i'

Output: 3


Input: Consider Input: Sentence: 'the interior of a bathroom with bathtub and corner sink'. Find frequency of the letter 'h'


Output: 4