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

Input: Consider Input: Sentence: 'a sailboat is floating near the rocky shore of a beach'. Find frequency of the letter 'o'

Output: 5


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 couple of beds sitting inside of a bedroom'. Find frequency of the letter 'a'


Output: 2