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

Input: Consider Input: Sentence: 'a child sitting a table with a pizza in front of him'. Find frequency of the letter 'h'

Output: 3


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 small silver plane captured in flight over a mountain scenery'. Find frequency of the letter 'e'


Output: 6