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

Input: Consider Input: Sentence: 'a person holding onto a pink kite at the beach'. Find frequency of the letter 'n'

Output: 4


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 man working on a small laptop on a wooden table'. Find frequency of the letter 'l'


Output: 4