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

Input: Consider Input: Sentence: 'a woman at a table checking her cell phone'. Find frequency of the letter 'a'

Output: 5


Input: Consider Input: Sentence: 'a dilapidated bench in a park under a tree'. Find frequency of the letter 'p'

Output: 2


Input: Consider Input: Sentence: 'a boy rolling his tongue for the camera'. Find frequency of the letter 'f'


Output: 1