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

Input: Consider Input: Sentence: 'a woman and a child walking down a street with a kite'. Find frequency of the letter 'n'

Output: 4


Input: Consider Input: Sentence: 'three men are in a kitchen cooking and cutting through a dish'. Find frequency of the letter 'a'

Output: 4


Input: Consider Input: Sentence: 'a group of people at a park flying kites'. Find frequency of the letter 'f'


Output: 2