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

Input: Consider Input: Sentence: 'slices of orange are arranged on a plate'. Find frequency of the letter 's'

Output: 2


Input: Consider Input: Sentence: 'a train sits on a railroad track as a metal awning covers it'. Find frequency of the letter 'l'

Output: 2


Input: Consider Input: Sentence: 'i am not sure what is in the mixture on the plate'. Find frequency of the letter 'i'


Output: 4