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: 'there is a person standing on a blue towel'. Find frequency of the letter 'n'

Output: 4


Input: Consider Input: Sentence: 'a white flower in a small clear vase'. Find frequency of the letter 'a'


Output: 5