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

Input: Consider Input: Sentence: 'a girl hitting a tennis ball on a court'. Find frequency of the letter 'l'

Output: 3


Input: Consider Input: Sentence: 'a man holding a frisbee high into the air'. Find frequency of the letter 'a'

Output: 4


Input: Consider Input: Sentence: 'a table with breakfast on it including bacon, berries, toast and a frittata'. Find frequency of the letter 'f'


Output: 2