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

Input: Consider Input: Sentence: 'a couple of items that are on the wall'. Find frequency of the letter 'm'

Output: 1


Input: Consider Input: Sentence: 'a traffic signal by a wire filled with some birds'. Find frequency of the letter 'e'

Output: 3


Input: Consider Input: Sentence: 'two elephants gently touch heads their heads together'. Find frequency of the letter 'g'


Output: 2