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:
//package codeforces.Round501;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.Scanner;

public class A {

    private static boolean[] axis;

    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        String[] values = br.readLine().split(" ");
        int totalSegmenets = Integer.valueOf(values[0]);
        int upperbound = Integer.valueOf(values[1]);
        axis = new boolean[upperbound+1];

        for(int i = 0; i < totalSegmenets; i++) {
            String[] segment = br.readLine().split(" ");
            int l = Integer.valueOf(segment[0]);
            int r = Integer.valueOf(segment[1]);
            for (int j = l; j <= r; j++) {
                axis[j] = true;
            }
        }

        int total = 0;
        for (int i = 1; i < axis.length; i++) {
            if (!axis[i]) total++;
        }
        StringBuilder sb = new StringBuilder();
        for (int i = 1; i < axis.length; i++) {
            if (!axis[i]) {
                sb.append(i);
                sb.append(" ");
            }
        }
        System.out.println(total);
        System.out.println(sb.toString().trim());
    }
}