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

Input: Consider Input: Sentence: 'a flock of sheep grazing in a park'. Find frequency of the letter 'f'

Output: 2


Input: Consider Input: Sentence: 'bananas are being dried in a tropical setting'. Find frequency of the letter 'i'

Output: 5


Input: Consider Input: Sentence: 'a man standing by a hole wearing flippers and a mask'. Find frequency of the letter 'm'


Output: 2