import java.util.*;
 
public class Test {
    private final static char[] chars;
    private final static Random random;
 
 
    
    static {
        chars = new char[52];
 
        for (int i = 0; i < 26; i ++) {
            chars[i] = (char) (97 + i);
            chars[i + 26] = (char) (65 + i);
        }
 random = new Random ();
        
    }
 
     public static void main (String[] args) {
        
            System.out.println (randomString (5));
        
    }
    
//      int random = (int)(Math.random()*40);
//      int random = new java.util.Random().nextInt(40);

    
    private static String randomString (int length) {
        //tried to convert into using Math.random instead of having to import
// Class RANDOM but MATH uses DOUBLES, and since with
// Arrays when setting the # of elements, you must use INT, seems like it'd be
//best/only possible?/efficient to use class Random instead of Math.random in
//this case? 
        char[] array = new char[length];

        for (int i = 0; i < length; i ++) {
            array[i] = chars[random.nextInt (chars.length)];
        }
 
        return new String (array);
    }
  
}