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

Input: Consider Input: Sentence: 'people seated on a table looking very happy'. Find frequency of the letter 'g'

Output: 1


Input: Consider Input: Sentence: 'a person riding a skate board on a city street'. Find frequency of the letter 'a'

Output: 5


Input: Consider Input: Sentence: 'a man and two women sitting in chairs at a table for four'. Find frequency of the letter 'a'


Output: 7