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 

#pragma GCC optimize("Ofast,unroll-loops")
#pragma GCC target("avx,avx2,sse,sse2")
#pragma comment(linker, "/stack:200000000")

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

#define int long long
#define pb push_back
#define pf push_front
#define eb emplace_back
#define mp make_pair
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define f first
#define s second
#define sz(x) (int)x.size()
#define endl "\n"
#define forn(i,n) for(int i=0;i<n;++i)
#define fore(i,l,r) for(int i=int(l);i<=int(r);++i)
#define rep(i,begin,end) for(__typeof(end) i=(begin);i!=(end);i++)
#define fill(a,value) memset(a,value,sizeof(a));
#define gcd(a,b) __gcd((a),(b))
#define watch1(x) cout<<(x)<<endl
#define watch2(x,y) cout<<(x)<<" "<<(y)<<endl
#define watch3(x,y,z) cout<<(x)<<" "<<(y)<<" "<<(z)<<endl
#define fastio ios::sync_with_stdio(0);cin.tie(0);cout.tie(0);

typedef long long ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef vector<int> vi;
typedef vector<vi> vvi;
typedef vector<pii> vpii;
typedef tree<pii, null_type, less<pii>, rb_tree_tag, tree_order_statistics_node_update> oset;

const int INF = 9e18;
const int mod = 1e9 + 7;
const int N = 2e5 + 5;

int i, j, n, m, deg[N], big[N], vis[N], cnt = 0;
set<int> comp[N], g[N], bad[N];

void dfs(int v)
{
    vis[v] = 1;
    comp[cnt].insert(v);
    for (int u : g[v])
    {
        if (!vis[u])
            dfs(u);
    }
}

void solve()
{
    cin >> n >> m;
    for (i = 1; i <= n; i++)
    {
        deg[i] = n - 1;
        big[i] = vis[i] = 0;
    }
    for (i = 1; i <= m; i++)
    {
        int x, y;
        cin >> x >> y;
        deg[x]--, deg[y]--;
        bad[x].insert(y);
        bad[y].insert(x);
    }
    for (i = 1; i <= n; i++)
    {
        if (2 * deg[i] <= n)
        {
            int l = 1, r;
            for (auto it = bad[i].begin(); it != bad[i].end(); it++)
            {
                r = *it;
                for (j = l; j < r; j++)
                {
                    g[i].insert(j);
                    g[j].insert(i);
                }
                l = r + 1;
            }
            r = n;
            for (j = l; j <= r; j++)
            {
                g[i].insert(j);
                g[j].insert(i);
            }
        }
        else
            big[i] = 1;
    }
    for (i = 1; i <= n; i++)
    {
        if (!big[i] && !vis[i])
        {
            cnt++;
            dfs(i);
        }
    }
    set<int> rem;
    for (i = 1; i <= n; i++)
    {
        if (big[i] && !vis[i])
            rem.insert(i);
    }
    int where = 0;
    for (i = 1; i <= cnt; i++)
    {
        for (int j : comp[i])
        {
            if (big[j])
            {
                where = i;
                break;
            }
        }
    }
    if (!where)
    {
        cnt++;
        for (int j : rem)
            comp[cnt].insert(j);
    }
    else
    {
        for (int j : rem)
            comp[where].insert(j);
    }
    vi ans;
    for (i = 1; i <= cnt; i++)
        ans.pb(sz(comp[i]));
    sort(all(ans));
    cout << cnt << endl;
    for (int j : ans)
        cout << j << " ";
}

signed main()
{
#ifndef ONLINE_JUDGE
    freopen("input.txt", "r", stdin);
    freopen("output.txt", "w", stdout);
#endif
    fastio;
    int t;
    //cin >> t;
    t = 1;
    while (t--)
    {
        solve();
    }
    return 0;
}
