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

Input: Consider Input: Sentence: 'a plastic plastic plate topped with three different type of food'. Find frequency of the letter 'l'

Output: 3


Input: Consider Input: Sentence: 'a person dressed all in black snowboarding down a slope'. Find frequency of the letter 'e'

Output: 4


Input: Consider Input: Sentence: 'a young boy holding a piece of paper on top of a table'. Find frequency of the letter 'y'


Output: 2