#include <fstream>
#include <vector>
#define Nmax 17000
#define pb push_back

using namespace std;

vector <int> L[Nmax];
int st[Nmax],dr[Nmax],n;
bool viz[Nmax],mark[Nmax];

inline bool Cuplez(int nod)
{
    if(viz[nod]) return false;
    for(auto it : L[nod])
        if(!dr[it])
        {
            st[nod]=it; dr[it]=nod; return true;
        }
    viz[nod]=true;
    for(auto it : L[nod])
        if(Cuplez(dr[it]))
        {
            st[nod]=it; dr[it]=nod; viz[nod]=false;
            return true;
        }
    return false;
}

inline void Solve(int nod)
{
    for(auto it : L[nod])
        if(!mark[it])
        {
            mark[it]=true; mark[dr[it]]=false; Solve(dr[it]);
        }
}

int main()
{
    int x,y,m,gata=0,sol=0,i;
    ifstream cin ("felinare.in");
    ofstream cout ("felinare.out");
    cin>>n>>m;
    while(m--)
    {
        cin>>x>>y;
        L[x].pb(y+n); L[y+n].pb(x);
    }
    while(!gata)
    {
        gata=1;
        for(i=1;i<=n;++i) viz[i]=false;
        for(i=1;i<=n;++i)
            if(!st[i] && Cuplez(i))
            {
                ++sol; gata=0;
            }
    }
    for(i=1;i<=n;++i)
        if(st[i]) mark[i]=true;
    for(i=1;i<=n;++i)
        if(!st[i]) Solve(i);
    cout<<2*n-sol<<"\n";
    for(i=1;i<=n;++i)
        if(!mark[i])
        {
            if(!mark[i+n]) cout<<"3\n";
            else cout<<"1\n";
        }
        else
        {
            if(!mark[i+n]) cout<<"2\n";
            else cout<<"0\n";
        }
    return 0;
}