#include <fstream>
#include <vector>
using namespace std;
ifstream cin("felinare.in");
ofstream cout("felinare.out");
const int lim=8191+5;
vector<int> vec[lim];
bool sl[lim],sr[lim];
int l[lim],r[lim];
bool ok[lim];
bool path(int nod)
{
    if(ok[nod])
        return false;
    ok[nod]=true;
    for(int x:vec[nod])
    if(!r[x] or path(r[x]))
    {
        l[nod]=x;
        r[x]=nod;
        return true;
    }
    return false;
}
void df(int nod)
{
    ok[nod]=true;
    sl[nod]=false;
    for(int x:vec[nod])
    if(!ok[r[x]])
    {
        sr[x]=true;
        df(r[x]);
    }
}
int main()
{
    int n,m,a,b;
    cin>>n>>m;
    for(int i=1;i<=m;++i)
    {
        cin>>a>>b;
        vec[a].push_back(b);
    }
    bool modif;
    int cuplaj=0;
    do
    {
        for(int i=1;i<=n;++i)
            ok[i]=false;
        modif=false;
        for(int i=1;i<=n;++i)
        if(!l[i] and path(i))
        {
            modif=true;
            ++cuplaj;
        }
    }while(modif);
    for(int i=1;i<=n;++i)
    if(l[i])
    {
        sl[i]=true;
        ok[i]=false;
    }
    for(int i=1;i<=n;++i)
    if(!l[i]) df(i);
    cout<<2*n-cuplaj<<'\n';
    for(int i=1;i<=n;++i)
    if(sl[i]==true and sr[i]==true) cout<<0<<'\n';
    else if(sl[i]==false and sr[i]==true) cout<<1<<'\n';
    else if(sl[i]==true and sr[i]==false) cout<<2<<'\n';
    else cout<<3<<'\n';
    return 0;
}