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

Input: Consider Input: Sentence: 'two computers and a laptop set up on a desk'. Find frequency of the letter 'r'

Output: 1


Input: Consider Input: Sentence: 'two people holding their skies in a snowy resort'. Find frequency of the letter 'n'

Output: 3


Input: Consider Input: Sentence: 'many buses are scattered together in a traffic jam'. Find frequency of the letter 'n'


Output: 2