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: 'hotel towels with sunglasses perched and hotel business cards and catalog'. Find frequency of the letter 'o'

Output: 4


Input: Consider Input: Sentence: 'the receipts from a meal at a restaurant are for  a sandwich, chili, and apple'. Find frequency of the letter 'u'


Output: 1