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

Input: Consider Input: Sentence: 'a group of people having dinner and drinking wine'. Find frequency of the letter 'r'

Output: 3


Input: Consider Input: Sentence: 'an audience watches as a bird spreads its wings'. Find frequency of the letter 'd'

Output: 3


Input: Consider Input: Sentence: 'the man is reading the paper on the bench'. Find frequency of the letter 'g'


Output: 1