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

Input: Consider Input: Sentence: 'a bunch of broken down trains sit in a yard'. Find frequency of the letter 'n'

Output: 5


Input: Consider Input: Sentence: 'a plane with smoke coming from the tips of both wings'. Find frequency of the letter 'c'

Output: 1


Input: Consider Input: Sentence: 'a small child smiles while holding a stuffed toy'. Find frequency of the letter 'm'


Output: 2