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

Input: Consider Input: Sentence: 'a teenager witting on a futon couch holding gaming controls in both hands'. Find frequency of the letter 'c'

Output: 3


Input: Consider Input: Sentence: 'a man pushing a cart full of bananas'. Find frequency of the letter 'u'

Output: 2


Input: Consider Input: Sentence: 'the female protester is displaying a relevant sign'. Find frequency of the letter 's'


Output: 4