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

Input: Consider Input: Sentence: 'a large motorcycle that has a man dressed in old clothing next to it'. Find frequency of the letter 'a'

Output: 6


Input: Consider Input: Sentence: 'a bowl of granola with raspberries and honey on top with a spoon'. Find frequency of the letter 'w'

Output: 3


Input: Consider Input: Sentence: 'a stop sign next to a metal building '. Find frequency of the letter 'd'


Output: 1