7 20
4 6
6 7
4 5
1 2
2 4
1 7
3 5
2 1
6 2
6 1
7 3
3 2
3 6
3 1
3 4
2 5
1 6
7 4
6 3
7 5
 8 23
1 2
1 4
1 6
1 8
2 3
2 4
2 5
2 6
2 7
2 8
3 4
3 5
3 6
3 7
3 8
4 5
4 6
4 7
5 6
5 7
5 8
6 8
7 8
 4 4
2 1
3 1
1 4
3 2
 8 18
1 4
1 6
1 7
2 3
2 4
2 5
2 6
2 7
2 8
3 4
3 8
4 7
5 6
5 7
5 8
6 7
6 8
7 8
 10 34
7 10
2 3
2 4
2 5
9 10
2 7
2 8
2 10
4 5
4 6
4 7
4 8
4 9
6 7
6 8
6 9
6 10
1 2
1 3
1 5
8 9
1 6
1 7
1 8
1 9
1 10
3 4
3 5
3 6
3 8
3 10
5 6
5 9
5 10
 5 7
1 2
2 3
3 4
1 5
2 5
3 5
4 5
 2 0
 8 23
2 7
7 5
8 6
8 2
6 3
3 5
8 1
8 4
8 3
3 4
1 2
2 6
5 2
6 4
7 6
6 5
7 8
7 1
5 4
3 7
1 4
3 1
3 2
 2 1
1 2
 6 9
1 2
1 4
1 5
2 3
2 5
2 6
3 5
4 6
5 6
 12 56
9 5
2 6
9 8
5 4
1 11
1 6
4 1
1 10
10 3
8 4
5 1
9 1
5 10
2 7
11 5
6 11
5 8
7 6
3 2
12 7
8 6
12 3
1 2
8 1
2 11
10 12
4 6
5 12
2 4
10 2
7 3
12 11
7 10
7 1
9 2
11 9
9 10
8 7
11 3
7 9
5 7
4 12
3 5
12 2
4 10
9 12
5 2
9 4
11 8
8 2
3 6
4 11
8 10
6 10
3 9
3 4
 12 58
1 2
1 3
1 4
1 5
1 6
1 7
1 8
1 10
1 11
1 12
2 3
2 4
2 5
2 6
2 7
2 8
2 9
2 10
2 11
2 12
3 4
3 5
3 6
3 7
3 8
3 9
3 10
3 11
3 12
4 5
4 6
4 8
4 11
4 12
5 6
5 7
5 8
5 9
5 10
5 11
6 7
6 8
6 9
6 10
6 11
6 12
7 8
7 9
7 10
7 11
7 12
8 9
8 10
8 11
9 10
9 11
9 12
10 12
 4 3
2 1
3 1
4 2
 3 1
2 3
 6 10
1 2
1 3
1 4
1 6
2 3
2 4
2 5
3 5
3 6
4 6
 11 49
10 3
6 4
11 3
7 6
10 6
6 1
4 3
10 2
4 5
9 2
10 1
5 7
1 5
9 7
2 11
8 6
3 9
2 5
9 5
6 5
1 4
11 9
1 7
8 10
3 6
3 7
11 5
6 9
4 10
8 7
4 9
8 2
4 2
8 11
7 4
9 10
8 1
10 7
3 2
5 8
8 9
1 3
2 7
10 11
5 3
10 5
4 11
1 11
8 3
 5 4
1 4
2 3
4 3
4 2
 4 3
1 2
3 1
4 3
 4 3
1 3
1 4
2 3
 10 36
7 8
7 9
2 3
2 4
2 5
9 10
2 7
2 8
2 9
2 10
4 5
4 6
4 7
4 8
4 10
6 7
6 9
6 10
1 2
1 3
1 4
8 9
1 5
8 10
1 7
1 8
1 9
1 10
3 4
3 6
3 7
3 9
5 6
5 7
5 9
5 10
 8 15
2 1
4 5
2 4
3 4
2 5
3 5
2 6
3 6
5 6
4 6
2 7
3 8
2 8
3 7
6 7

3
1 2 4 
 3
1 2 5 
 2
1 3 
 1
8 
 1
10 
 2
1 4 
 1
2 
 3
1 3 4 
 2
1 1 
 1
6 
 3
1 4 7 
 4
1 1 1 9 
 1
4 
 1
3 
 1
6 
 5
1 1 1 2 6 
 1
5 
 1
4 
 1
4 
 2
2 8 
 1
8 

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Map.Entry;
import java.util.Random;
import java.util.StringTokenizer;
import java.util.TreeMap;
import java.util.TreeSet;

public class ConnectedComponents {
	static class Edge implements Comparable<Edge> {
		int from, to;

		public Edge(int f, int t) {
			from = Math.min(f, t);
			to = Math.max(f, t);
		}

		@Override
		public int compareTo(ConnectedComponents.Edge o) {
			if (from == o.from)
				return to - o.to;
			return from - o.from;
		}

	}

	static int[] parent;

	static int parent(int x) {
		if (x == parent[x])
			return x;
		return parent[x] = parent(parent[x]);
	}

	static void merge(int x, int y) {
		int p1 = parent(x);
		int p2 = parent(y);
		parent[p1] = p2;
	}

	public static void main(String[] args) {
		InputReader r = new InputReader(System.in);
		int n = r.nextInt();
		int m = r.nextInt();
		parent = new int[n];
		for (int i = 0; i < parent.length; i++) {
			parent[i] = i;
		}
		TreeSet<Edge> edges = new TreeSet<Edge>();
		int[] cnt = new int[n];
		for (int i = 0; i < m; i++) {
			int from = r.nextInt() - 1;
			int to = r.nextInt() - 1;
			cnt[from]++;
			cnt[to]++;
			edges.add(new Edge(from, to));
		}
		int k = Math.min(n, 500000);
		Random rand = new Random();
		while (k-- > 0) {
			int start = rand.nextInt(n);
			int end = rand.nextInt(n);
			Edge e = new Edge(start, end);
			if (!edges.contains(e)) {
				merge(start, end);
			}
		}
		for (int i = 0; i < Math.min(n, 100); i++) {
			int end = rand.nextInt(n);
			for (int j = 0; j < n; j++) {
				Edge e = new Edge(end, j);
				if (!edges.contains(e)) {
					merge(end, j);
				}
			}
		}

		for (int i = 0; i < n; i++) {
			if (cnt[i] == n - 1)
				continue;
			int share = Math.min(1000000 / n, 1000);
			while (share-- > 0) {
				int end = rand.nextInt(n);
				Edge e = new Edge(i, end);
				if (!edges.contains(e)) {
					merge(i, end);
				}
			}

		}

		TreeMap<Integer, Integer> map = new TreeMap<Integer, Integer>();
		for (int i = 0; i < parent.length; i++) {
			if (!map.containsKey(parent(i)))
				map.put(parent(i), 0);
			map.put(parent(i), map.get(parent(i)) + 1);
		}
		System.out.println(map.size());
		ArrayList<Integer> list = new ArrayList<Integer>();
		for (Entry<Integer, Integer> e : map.entrySet()) {
			list.add(e.getValue());
		}
		Collections.sort(list);
		for (int x : list)
			System.out.println(x);
	}

	static class InputReader {
		private BufferedReader reader;
		private StringTokenizer tokenizer;

		public InputReader(InputStream stream) {
			reader = new BufferedReader(new InputStreamReader(stream));
			tokenizer = null;
		}

		public InputReader(FileReader stream) {
			reader = new BufferedReader(stream);
			tokenizer = null;
		}

		public String nextLine() {
			try {
				return reader.readLine();
			} catch (IOException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
				return null;
			}
		}

		public String next() {
			while (tokenizer == null || !tokenizer.hasMoreTokens()) {
				try {
					tokenizer = new StringTokenizer(reader.readLine());
				} catch (IOException e) {
					throw new RuntimeException(e);
				}
			}
			return tokenizer.nextToken();
		}

		public int nextInt() {
			return Integer.parseInt(next());
		}

		public long nextLong() {
			return Long.parseLong(next());
		}

		public double nextDouble() {
			return Double.parseDouble(next());
		}
	}
}
