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 plane with stairs next to it sitting in a large lot'. Find frequency of the letter 'i'

Output: 6


Input: Consider Input: Sentence: 'an empty blue bench overlooks a beach and a hill with homes'. Find frequency of the letter 'n'


Output: 3