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

Input: Consider Input: Sentence: 'eight donuts are cooked together in oil in a metal tray'. Find frequency of the letter 'h'

Output: 2


Input: Consider Input: Sentence: 'a little dog on a table while a dog groomer cuts its fur'. Find frequency of the letter 'r'

Output: 3


Input: Consider Input: Sentence: 'a black and white photo of a baby giraffe'. Find frequency of the letter 'a'


Output: 6