/* package whatever; // don't place package name! */
 
import java.util.concurrent.ThreadLocalRandom;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	private static final String chars = "abcdefghijklmnopqrstuvwxyz";
    private static final String CHARS = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
    private static final String NUMS = "1234567890";
    private static final String SPEC = "@#$%^&+=";
 
    public static void main(String[] args) {
        StringBuffer buf = new StringBuffer(8);
        appendChars(2, chars, buf);
        appendChars(2, CHARS, buf);
        appendChars(2, NUMS, buf);
        appendChars(2, SPEC, buf);
 
        System.out.println(buf);
    }
 
    private static void appendChars(int n, String src, StringBuffer buf) {
        ThreadLocalRandom r = ThreadLocalRandom.current();
        while (--n >= 0) buf.append(src.charAt(r.nextInt(src.length())));
    }
}

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