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 start = 8;
		int end = n - n4 + 8;
		if (8 <= l && r <= end) start = 4;

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

		switch (n4) {
		case 1:
			System.out.println(x);
			break;
		case 2:
			if (x == 1) {
				System.out.println(2);
				System.out.println(3);
			} else {
				System.out.println(x % 2 == 0 ? x + 1 : x - 1);
				System.out.println(1);
			}
			break;
		case 3:
			if (x == 1) {
				System.out.println(3);
				System.out.println(5);
				System.out.println(7);
			} else if (x < 4) {
				System.out.println(x % 2 == 0 ? x + 1 : x - 1);
				System.out.println(6);
				System.out.println(7);
			} else {
				System.out.println(x % 2 == 0 ? x + 1 : x - 1);
				System.out.println(2);
				System.out.println(3);
			}
			break;
		default:
			if (x == 1) {
				System.out.println(1);
				System.out.println(2);
				System.out.println(4);
				System.out.println(6);
			} else if (x < 4) {
				System.out.println(x);
				System.out.println(1);
				System.out.println(4);
				System.out.println(5);
			} else {
				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 + 0);
					System.out.println(x - x4 + 1);
				}
			}
		}
	}
}