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

Input: Consider Input: Sentence: 'a laptop computer with pictures of giraffes on the homescreen'. Find frequency of the letter 'o'

Output: 5


Input: Consider Input: Sentence: 'a flock of sheep grazing in a park'. Find frequency of the letter 'f'

Output: 2


Input: Consider Input: Sentence: 'conference room with big screen on wall and table in the center with a workstation on the side'. Find frequency of the letter 'h'


Output: 4