#include <bits/stdc++.h>
using namespace std;
ifstream f ("felinare.in");
ofstream g ("felinare.out");
const int nmax=1e4+3;
int viz[nmax],st[nmax],dr[nmax],n,m,a,b,ok,sol,usu[nmax];
vector <int> v[nmax];
inline int cuplez(int nod)
{
    if(viz[nod]) return 0;
    viz[nod]=1;
    for(int i=0;i<v[nod].size();++i)
    {
        int urm=v[nod][i];
        if(!dr[urm])
        {
            dr[urm]=nod;
            st[nod]=urm;
            return 1;
        }
    }
    for(int i=1;i<v[nod].size();++i)
    {
        int urm=v[nod][i];
        if(cuplez(dr[urm]))
        {
            dr[urm]=nod;
            st[nod]=urm;
            return 1;
        }
    }
    return 0;
}
int main()
{
    ios::sync_with_stdio(false);
    f>>n>>m;
    while(m--)
    {
        f>>a>>b;
        v[a].push_back(b);
    }
    ok=1;
    while(ok)
    {
        ok=0;
        memset(viz,0,sizeof(viz));
        for(int i=1;i<=n;++i) if(cuplez(i)) ok=1;
    }
    for(int i=1;i<=n;++i) if(st[i]) ++sol;
    g<<2*n-sol;
    g<<'\n';
    for(int i=1;i<=n;++i)
    {
        if(!dr[i]) usu[i]=3;
        else usu[i]=2;
    }
    for(int i=1;i<=n;++i) g<<usu[i]<<'\n';
    return 0;
}