Problem: You are given a set of n segments on the axis Ox, each segment has integer endpoints between 1 and m inclusive. Segments may intersect, overlap or even coincide with each other. Each segment is characterized by two integers l_i and r_i (1 ≤ l_i ≤ r_i ≤ m) — coordinates of the left and of the right endpoints. 

Consider all integer points between 1 and m inclusive. Your task is to print all such points that don't belong to any segment. The point x belongs to the segment [l; r] if and only if l ≤ x ≤ r.

Input

The first line of the input contains two integers n and m (1 ≤ n, m ≤ 100) — the number of segments and the upper bound for coordinates.

The next n lines contain two integers each l_i and r_i (1 ≤ l_i ≤ r_i ≤ m) — the endpoints of the i-th segment. Segments may intersect, overlap or even coincide with each other. Note, it is possible that l_i=r_i, i.e. a segment can degenerate to a point.

Output

In the first line print one integer k — the number of points that don't belong to any segment.

In the second line print exactly k integers in any order — the points that don't belong to any segment. All points you print should be distinct.

If there are no such points at all, print a single integer 0 in the first line and either leave the second line empty or do not print it at all.

Examples

Input

3 5
2 2
1 2
5 5


Output

2
3 4 


Input

1 7
1 7


Output

0

Note

In the first example the point 1 belongs to the second segment, the point 2 belongs to the first and the second segments and the point 5 belongs to the third segment. The points 3 and 4 do not belong to any segment.

In the second example all the points from 1 to 7 belong to the first segment.

Solution (in JAVA):

Solution:
/*
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 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
import java.util.*;

/**
 *
 * @author BluLogix
 */
public class Main {

    public static void main(String[] args) {
        Scanner input = new Scanner(System.in);
        int m = input.nextInt();
        int n = input.nextInt();
        int val[] = new int[n + 1];
        StringBuilder out = new StringBuilder();
        for (int i = 0; i < m; i++) {
            int start = input.nextInt();
            int end = input.nextInt();
            val[start] += 1;
            if (end != n) {
                val[end + 1] += -1;
            }
        }
        for (int i = 1; i <= n; i++) {
            val[i] += val[i - 1];
        }
        boolean found = false;
        int start = -1;
        int end = -1;
        int count = 0;
        for (int i = 1; i <= n; i++) {
            if (val[i] == 0 && !found) {
                start = i;
                end = i;
                found = true;
            } else if (val[i] == 0 && found) {
                end = i;
            } else {
                if (found) {
                    count += end - start + 1;
                    for (int j = start; j <= end; j++) {
                        out.append(j).append(" ");
                    }
                }
                start = -1;
                end = -1;
                found = false;
            }
        }
        if (found) {
            count += end - start + 1;
            for (int j = start; j <= end; j++) {
                out.append(j).append(" ");
            }
        }
        System.out.println(count);
        System.out.println(out.toString());
    }

}