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

Input: Consider Input: Sentence: 'the sun goes down over a bike tied to a bench at the beach'. Find frequency of the letter 't'

Output: 5

Input: Consider Input: Sentence: 'a table topped with a cupcake on a picture of a cupcake'. Find frequency of the letter 'o'

Output: 3

Input: Consider Input: Sentence: 'people gather at the beach with black umbrellas'. Find frequency of the letter 'l'
Output: 4