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

Input: Consider Input: Sentence: 'a small wrinkley dog wearing a bow tie'. Find frequency of the letter 'e'

Output: 3


Input: Consider Input: Sentence: 'a man paddle boarding by a boat dock in a city'. Find frequency of the letter 'o'

Output: 3


Input: Consider Input: Sentence: 'a cat standing inside of a dresser drawer'. Find frequency of the letter 'n'


Output: 3