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

Input: Consider Input: Sentence: 'supplies and tools are arranged on the floor with a hard hat and bag'. Find frequency of the letter 'n'

Output: 4


Input: Consider Input: Sentence: 'an old glass vase containing flowers on a glass table'. Find frequency of the letter 'b'

Output: 1


Input: Consider Input: Sentence: 'a zebra standing next to a fence  looking sad'. Find frequency of the letter 'f'


Output: 1