public class HelloWorld {

     public static final String chars = "`~1!2@3#4$5%6^7&8*9(0)-_=+qwertyuiop[{]}asdfghjkl;:zxcvbnm,<.>/?";
     public static final int length = chars.length();
     public static int limit = 2;

     public static void main(String []args) {
        double max = Math.pow(chars.length(), limit);
        System.out.println("Test: " + find(4096 - 1));
     }

     public static String find(int i) {
        String base = String.valueOf(i);
        String result = "";

        if (i < length) {
            result += chars.substring(i, i + 1);
        } else {
            int divide = i / length;
            int multiply = divide * length;

            if (divide >= length) {
                return "NULL";
            }
            result += chars.substring(divide, divide + 1);

            i -= multiply;
            result += chars.substring(i, i + 1);
        }
        return result;
     }
}