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

Input: Consider Input: Sentence: 'people plating cake in an office meeting room'. Find frequency of the letter 'g'

Output: 2


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 boy in a red shirt in front of some food'. Find frequency of the letter 'o'


Output: 6