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

Input: Consider Input: Sentence: 'a view from a bathroom shows an open door'. Find frequency of the letter 'o'

Output: 7


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 giraffe standing in the middle of a grassy area and lots of trees'. Find frequency of the letter 'a'


Output: 8