In Berland recently a new collection of toys went on sale. This collection consists of 109 types of toys, numbered with integers from 1 to 109. A toy from the new collection of the i-th type costs i bourles.

Tania has managed to collect n different types of toys a1, a2, ..., an from the new collection. Today is Tanya's birthday, and her mother decided to spend no more than m bourles on the gift to the daughter. Tanya will choose several different types of toys from the new collection as a gift. Of course, she does not want to get a type of toy which she already has.

Tanya wants to have as many distinct types of toys in her collection as possible as the result. The new collection is too diverse, and Tanya is too little, so she asks you to help her in this.

Input

The first line contains two integers n (1 ≤ n ≤ 100 000) and m (1 ≤ m ≤ 109) — the number of types of toys that Tanya already has and the number of bourles that her mom is willing to spend on buying new toys.

The next line contains n distinct integers a1, a2, ..., an (1 ≤ ai ≤ 109) — the types of toys that Tanya already has.

Output

In the first line print a single integer k — the number of different types of toys that Tanya should choose so that the number of different types of toys in her collection is maximum possible. Of course, the total cost of the selected toys should not exceed m.

In the second line print k distinct space-separated integers t1, t2, ..., tk (1 ≤ ti ≤ 109) — the types of toys that Tanya should choose.

If there are multiple answers, you may print any of them. Values of ti can be printed in any order.

Examples

Input

3 7
1 3 4


Output

2
2 5 


Input

4 14
4 6 12 8


Output

4
7 2 3 1

Note

In the first sample mom should buy two toys: one toy of the 2-nd type and one toy of the 5-th type. At any other purchase for 7 bourles (assuming that the toys of types 1, 3 and 4 have already been bought), it is impossible to buy two and more toys.
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.stream.IntStream;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;

import java.util.Arrays;
import java.util.List;
import java.util.HashSet;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.LinkedList;
import java.util.List;
import java.math.BigInteger;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Queue;
import java.util.Scanner;
import java.util.StringTokenizer;
import java.util.TreeMap;

public class Dragons {
	 
    static class Pair {
        long a;
        long b;
        public Pair(long a, long b){
            this.a=a;
            this.b=b;
        }
    }
	static ArrayList<Integer>[]adjList;
	static boolean[] color;
	static boolean visited[];
	static int max=0;
	static ArrayList<ArrayList<Integer>> nodes;
	static ArrayList<Long> arr;
	public static void main(String[] args) throws IOException {
Scanner sc=new Scanner(System.in);
long n=sc.nextLong();
long m=sc.nextLong();
HashSet<Long> hs=new HashSet<Long>();

for(int i=1;i<=n;i++) {
	long h=sc.nextLong();
	hs.add(h);
}
long  i=1;
long count=0;
ArrayList<Long> al=new ArrayList<Long>();
while(m>0) {
	
		if(m<i) {
			
			break;
		}
		if(hs.contains(i)) {
			i++;
			continue;
		}
		al.add(i);
		m=m-i;
		count++;
		i++;
	
}
System.out.println(count);
for(int j=0;j<al.size();j++) {
	System.out.print(al.get(j)+" ");
}

	}
	static void dfs(int node,int sum,int[] arr,int m) {
		if(arr[node]+sum>m) {
			return;
		}
		visited[node]=true;
		boolean leaf=true;
		for(Integer i:nodes.get(node)) {
			if(!visited[i]) {
				if(arr[node]==1) {
					dfs(i,sum+1,arr,m);
				}else {
					dfs(i,0,arr,m);
				}
				leaf=false;
			}
		}
		
		if(leaf) {
			max++;
		}
		
		
		
		
	}
	static boolean dividetwothree(long n) {
		while(n!=1) {
			if(n%2==0) {
				n=n/2;
			}else if(n%3==0){
				n=n/3;
			}else {
				return false;
			}
			
			
		}
		return true;
	}
	static boolean isLuckyNumber(int n){
		while(n>0) {
			int y=n%10;
			n=n/10;
			if(y!=4 && y!=7) {
				return false;
			}
		}
		return true;
	}
	static boolean isInteger(double N)
	{
	 
	    // Convert float value
	    // of N to integer
	    long X = (long)N;
	    double temp2 = N - X;
	 
	    // If N is not equivalent
	    // to any integer
	    if (temp2 > 0)
	    {
	        return false;
	    }
	    return true;
	}
	static long isrecursive(long p) {
		if(p==0) {
			return 0;
		}else if(p%2==0) {
			return isrecursive(p/2);
		}else {
			return isrecursive(p/2)+1;
		}
		
	}
	static int islucky(int r) {
		String temp = Integer.toString(r);
		int[] newGuess = new int[temp.length()];
		int tu=0;
		for (int i = 0; i < temp.length(); i++)
		{
		    newGuess[i] = temp.charAt(i) - '0';
		    if(newGuess[i]==4 || newGuess[i]==7) {
		    	tu=tu*10+newGuess[i];
		    }
		}
		return tu;
	}
	static int distance(long l,long m) {
		return (int) (Math.pow(l,2)+Math.pow(m,2));
	}
	static int findSmallest(int N)
	{
	  
	    // Base case
	    if (N == 0)
	        return 2;
	    if (N == 1)
	        return 1;
	  
	    int prime = N, counter = 0;
	    boolean found = false;
	  
	    // Loop continuously until isPrime returns
	    // true for a number greater than n
	    while (!found) {
	        if (isPrime(prime))
	            found = true;
	        else {
	  
	            // If the number is not a prime, then
	            // increment the number by 1 and the
	            // counter which stores the number
	            // to be added
	            prime++;
	            counter++;
	        }
	    }
	  
	    return counter;
	}
	static boolean isPrime(int n)
	{
	    // Base cases
	    if (n <= 1)
	        return false;
	    if (n <= 3)
	        return true;
	  
	    // This is checked so that we can skip
	    // middle five numbers in below loop
	    if (n % 2 == 0 || n % 3 == 0)
	        return false;
	  
	    // For all the remaining numbers, check if
	    // any number is a factor if the number
	    // or not
	    for (int i = 5; i * i <= n; i = i + 6)
	        if (n % i == 0 || n % (i + 2) == 0)
	            return false;
	  
	    // If none of the above numbers are the
	    // factors for the number, then the
	    // given number is prime
	    return true;
	}
	
	
		static int mod(int a, int m)
		{
		    return (a%m + m) % m;
		}
		
	static long getSum(long y)
    {
       long sum = 0;
 
        while (y != 0) {
            sum = sum + y % 10;
            y = y / 10;
        }
 
        return sum;
    }
	static boolean detect(int arr[],int x) {
		long sum=0;
		for(int i=0;i<arr.length;i++) {
			sum+=arr[i];
			if(sum==x) {
				return true;
			}
			
		}
		return false;
	}
	
    static class Node {
        String s;
        int val;
 
        public Node(String a, int v) {
            val = v;
            s = a;
        }
    }
	  
	 public static HashMap<String, Integer> sortByValue(HashMap<String, Integer> hm)
	    {
	        // Create a list from elements of HashMap
	        List<Map.Entry<String, Integer> > list =
	               new LinkedList<Map.Entry<String, Integer> >(hm.entrySet());
	 
	        // Sort the list
	        Collections.sort(list, new Comparator<Map.Entry<String, Integer> >() {
	            public int compare(Map.Entry<String, Integer> o1,
	                               Map.Entry<String, Integer> o2)
	            {
	                return -(o1.getValue()).compareTo(o2.getValue());
	            }
	        });
	         
	        // put data from sorted list to hashmap
	        HashMap<String, Integer> temp = new LinkedHashMap<String, Integer>();
	        for (Map.Entry<String, Integer> aa : list) {
	            temp.put(aa.getKey(), aa.getValue());
	        }
	        return temp;
	    }
	
	 static long lcm(long a, long b)
	    {
	        return (a / gcd(a, b)) * b;
	    }
static class FastScanner {
		BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
		StringTokenizer st=new StringTokenizer("");
		String next() {
			while (!st.hasMoreTokens())
				try {
					st=new StringTokenizer(br.readLine());
				} catch (IOException e) {
					e.printStackTrace();
				}
			return st.nextToken();
		}
		
		int nextInt() {
			return Integer.parseInt(next());
		}
		int[] readArray(int n) {
			int[] a=new int[n];
			for (int i=0; i<n; i++) a[i]=nextInt();
			return a;
		}
		long nextLong() {
			return Long.parseLong(next());
		}
	}
	
	
//static void reduceFraction(int x, int y) 
//{ 
//    int d; 
//    d = gcd(x, y); 
//  
//    x = x / d; 
//    y = y / d; 
//  if(x>0 && y<0) {
//	  x=-x;
//	  y=-y;
//  }
//    System.out.println(y); 
//} 
	
	static long gcd(long a, long b) {
		return a%b == 0 ? b : gcd(b,a%b);
	}
	 static int getSum(int n)
	    {
	        int sum = 0;
	 
	        while (n != 0) {
	            sum = sum + n % 10;
	            n = n / 10;
	        }
	 
	        return sum;
	    }
	
	static boolean[] sieve(int n) {
		
		boolean isPrime[] = new boolean[n+1];
		for(int i = 2; i <= n; i++) {
			if(isPrime[i]) continue;
			for(int j = 2*i; j <= n; j+=i) {
				isPrime[j] = true;
			}
		
		} 
		return isPrime;
		
	}
}