Write a java program that reads an integer N (2 <= N <= 10000) from an input file named input7.txt and then outputs

a. All numbers that are divisible by 3 to the output file named output7A.txt

b. All primes from 2 to N to the output file named output7B.txt

Requirements:

+ For each part a) and b), define a method called readDataFromFile() that takes into account the input filename as the parameter and returns the number N.

+ In part a), write a function called printNumbersToFile() that takes the output filename as the parameter and prints out all numbers which are divisible by 3 (0 excluded).

+ In part b), write a function called

printPrimesToFile() that takes the output filename as the parameter and prints out all primes.

Example:

Input

File input7.txt

10

Output

File output7A.txt 369

File output7B.txt 2357