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

Input: Consider Input: Sentence: 'a display case filled with lots of different clocks'. Find frequency of the letter 'w'

Output: 1


Input: Consider Input: Sentence: 'a log in the water with three birds perched on it'. Find frequency of the letter 'r'

Output: 4


Input: Consider Input: Sentence: 'a group of people wearing cold weather attire, backpacks and skies, follow eachother'. Find frequency of the letter 's'


Output: 3