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 meat covered in ketchup next to a hamburger on a green plate'. Find frequency of the letter 'g'

Output: 2


Input: Consider Input: Sentence: 'a dog laying on the back of a boat in the water'. Find frequency of the letter 't'

Output: 4


Input: Consider Input: Sentence: 'his eyes are closed and maybe it is nap time'. Find frequency of the letter 't'


Output: 2