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 ();
    }

    private int generate(int x, int y) {
       x = 5;
       y = 6;
       int range = y - x + 1;
       int rangeX;
       rangeX = (int)(Math.random() * range) + x;
       return rangeX;
    }

    private String randomString (int length) {
        char[] array = new char[length];

        for (int i = 0; i < length; i ++) {
            array[i] = chars[random.nextInt (chars.length)];
        }
 
        return new String (array);
    }  
    
     public static void main (String[] args) {
        Test test = new Test();
        System.out.println(test.randomString(test.generate(5,6);));
    }    
}