import java.util.*;

public class concatenate_array_list {
    public static void main( String[] args ) {
	ArrayList<String> A = new ArrayList<String>();
	ArrayList<String> B = new ArrayList<String>();
	ArrayList<String> C = new ArrayList<String>();

	A.add("abc");
	A.add("def");
	B.add("gef");
	
	C.addAll(A);
	C.addAll(B);

	for (String e : C) {
	    System.out.println(e);
	}
    }
}