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: 'three birds are sitting on a tree in a forest'. Find frequency of the letter 'h'

Output: 1


Input: Consider Input: Sentence: 'two cows munch on grass in a meadow'. Find frequency of the letter 'o'


Output: 4