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

Input: Consider Input: Sentence: 'different sets of luggage in a baggage claim area'. Find frequency of the letter 'r'

Output: 2


Input: Consider Input: Sentence: 'a green bus driving in a street filled with heavy traffic'. Find frequency of the letter 'v'

Output: 2


Input: Consider Input: Sentence: 'two people on motorcycles driving on the pavement near another man'. Find frequency of the letter 'g'


Output: 1