#include <fstream>
#include <vector>
#include <cstring>

#define maxn 8192

using namespace std;

ifstream fin("felinare.in");
ofstream fout("felinare.out");

int n,m,a,b,sw,targeted[maxn],coupled[maxn];
vector <int> RG[maxn],LG[maxn];
bool ok,viz[maxn],viz2[maxn],fel1[maxn],fel2[maxn];

bool find_augmenting_path_right (int node);

bool find_augmenting_path_left (int node)
{
    bool ok=0;

    for (vector<int>::iterator it=LG[node].begin(); it!=LG[node].end(); ++it)
    {
        if (!fel1[*it])
        ok |= find_augmenting_path_right (*it);
        if (ok) break;
    }

    if (ok) {fel2[node]=0; return 1;}
    return 0;
}

bool find_augmenting_path_right (int node)
{
    if (viz[node]) return 0;
    viz[node]=1;
    bool ok=1;

    for (vector<int>::iterator it=RG[node].begin(); it!=RG[node].end(); ++it)
    {
        if (fel2[*it])
        ok &= find_augmenting_path_left (*it);
        if (!ok) break;
    }

    if (ok)
    {
        fel1[node]=1;
        return 1;
    }
    return 0;
}

int main()
{
    fin>>n>>m;

    for (int i=1; i<=m; i++)
    {
        fin>>a>>b;
        RG[a].push_back(b);
        LG[b].push_back(a);
    }

    int matching=n;

    memset (fel1,0,n+1);
    memset (fel2,1,n+1);

    do
    {
        ok=0;
        memset (viz,0,n+1);
        for (int i=1; i<=n; i++)
        if (!fel1[i])
        {
            if (find_augmenting_path_right(i))
            {
                ++matching;
                ok=1;
            }
        }

    } while (ok);

    fout<<matching<<"\n";

    for (int i=1; i<=n; i++)
    {
        if (fel1[i]==0 && fel2[i]==0) fout<<0;
        else if (fel1[i]>0 && fel2[i]==0) fout<<1;
        else if (fel1[i]==0 && fel2[i]>0) fout<<2;
        else fout<<3;
        fout<<"\n";
    }
    return 0;
}