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

Input: Consider Input: Sentence: 'a piece of bread stuffed with meat and vegetables'. Find frequency of the letter 's'

Output: 2


Input: Consider Input: Sentence: 'a baseball player dropping his bat and starting to run'. Find frequency of the letter 'o'

Output: 2


Input: Consider Input: Sentence: 'a group of women sit at a table in a restaurant with their food'. Find frequency of the letter 'a'


Output: 7