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

Input: Consider Input: Sentence: 'three people are gathered around sitting on a park bench'. Find frequency of the letter 'g'

Output: 2


Input: Consider Input: Sentence: 'a person holding onto a pink kite at the beach'. Find frequency of the letter 'n'

Output: 4


Input: Consider Input: Sentence: 'a woman standing on a tennis court while a crowd of people watches her'. Find frequency of the letter 'r'


Output: 3