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

Output: 4


Input: Consider Input: Sentence: 'a boy is watching a bird by the shoreline'. Find frequency of the letter 'o'


Output: 2