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

Input: Consider Input: Sentence: 'four women around a man sitting in front of a cake'. Find frequency of the letter 'o'

Output: 5


Input: Consider Input: Sentence: 'a bus is driving on the street behind some cars'. Find frequency of the letter 'a'

Output: 2


Input: Consider Input: Sentence: 'an apartment kitchen with wooden cupboards and a bar extension'. Find frequency of the letter 'n'


Output: 7