#include <fstream>
#include<algorithm>
#include<vector>
#include<cmath>
using namespace std;

ifstream cin("felinare.in");
ofstream cout("felinare.out");

int n,m,i,ins,outs,a,b;
vector<int> in[9000],out[9000];

int main()
{
    cin>>n>>m;
    for(i=1;i<=m;i++){
       cin>>a>>b;
       out[a].push_back(b);
       in[b].push_back(a);
    }
    for(i=1;i<=n;i++){
        if(out[i].size()==0){
            outs++;
        }
        if(in[i].size()==0){
            ins++;
        }
    }
    cout<<n+max(ins,outs)<<'\n';

    if(ins<=outs){
        for(i=1;i<=n;i++){
            if(out[i].size()==0){
                cout<<3<<'\n';
            }else{
                cout<<1<<'\n';
            }
        }
    }else{
        for(i=1;i<=n;i++){
            if(in[i].size()==0){
                cout<<3<<'\n';
            }else{
                cout<<2<<'\n';
            }
        }
    }
    return 0;
}