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

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 man opening up a package sitting on a couch'. Find frequency of the letter 'n'

Output: 5


Input: Consider Input: Sentence: 'a dog that is laying out in the green grass'. Find frequency of the letter 'e'


Output: 3