import java.io.BufferedReader;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws Exception {
		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
		String[] sa = br.readLine().split(" ");
		int n = Integer.parseInt(sa[0]);
		int x = Integer.parseInt(sa[1]);
		br.close();

		int n4 = n % 4;
		if (n4 == 0) n4 = 4;
		int x4 = x % 4;
		int l = x - x4;
		int r = x - x4 + 4;
		int end = n - n4 + 4;
		if (4 <= x && x < 8) end += 4;

		for (int i = 4; i < end; i++) {
			if (l <= i && i < r) {
				continue;
			}
			System.out.println(i);
		}

		switch (n4) {
		case 1:
			System.out.println(x);
			break;
		case 2:
			System.out.println(x % 2 == 0 ? x + 1 : x - 1);
			System.out.println(1);
			break;
		case 3:
			System.out.println(x % 2 == 0 ? x + 1 : x - 1);
			System.out.println(2);
			System.out.println(3);
			break;
		default:
			System.out.println(x);
			System.out.println(1);
			if (x4 < 2) {
				System.out.println(x - x4 + 2);
				System.out.println(x - x4 + 3);
			} else {
				System.out.println(x - x4);
				System.out.println(x - x4 + 1);
			}
		}
	}
}