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

Input: Consider Input: Sentence: 'an elephant has taken a man's hat in its trunk'. Find frequency of the letter 'p'

Output: 1


Input: Consider Input: Sentence: 'a microwave oven with a yellow note on the door'. Find frequency of the letter 'w'

Output: 3


Input: Consider Input: Sentence: 'four road signs giving different information by a brick building'. Find frequency of the letter 'b'


Output: 3