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 that has a kite in the air'. Find frequency of the letter 'r'

Output: 2


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 boy runs as he tries to smack the tennis ball'. Find frequency of the letter 'k'


Output: 1