import java.util.Random;
public class MyClass {
public static void main(String args[]) {
String s = "abcXYZ";
Random r = new Random();
for (int i = 0; i < 20; i++) {
System.out.print(s.charAt(r.nextInt(s.length())));
}
}
}
/*
run:
YaXYbYXZXYaZacbYcZXY
*/