problem 9 restage

uil/october-2013/9/src/problem9.java

@@ -1,4 +1,26 @@
-package PACKAGE_NAME;
+import static java.lang.System.*;
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.util.Scanner;
 
 public class problem9 {
+    public static void main(String[] args) throws FileNotFoundException {
+        File input = new File("input.dat");
+        Scanner read = new Scanner(input);
+
+        while (read.hasNextInt()) {
+            int x = read.nextInt(); int y = read.nextInt();
+            boolean isSexy = (Math.abs(x - y) == 6) && (isPrime(x) && isPrime(y));
+            out.println((isSexy) ? "SEXY" : "NOT");
+        }
+    }
+
+    // Super crap prime function, could be optimized as hell but whatever
+    static boolean isPrime(int n) {
+        for(int x = n - 1; x > 1; x-=1) {
+            if(n % x == 0)
+                return false;
+        }
+        return true;
+    }
 }