#include<fstream>
#include<vector>
#define N 8200
using namespace std;
ifstream f("felinare.in");
ofstream g("felinare.out");
int i,n,m,x,y,ok,nr,ok1[N],ok2[N],st[N],dr[N],viz[N];
vector<int>v[N];
inline bool cupleaza(int x)
{
    if(viz[x])
    return 0;
    viz[x]=1;
    for(vector<int>::iterator it=v[x].begin();it!=v[x].end();++it)
    if(!dr[*it]||cupleaza(dr[*it]))
    {
        st[x]=*it;
        dr[*it]=x;
        return 1;
    }
    return 0;
}
inline void fa(int x)
{
    for(vector<int>::iterator it=v[x].begin();it!=v[x].end();++it)
    {
        if(!ok2[*it])
        {
            ok2[*it]=1;
            ok1[dr[*it]]=0;
            fa(dr[*it]);
        }
    }
}
int main()
{
    f>>n>>m;
    for(i=1;i<=m;++i)
    {
        f>>x>>y;
        v[x].push_back(y);
    }
    ok=1;
    while(ok)
    {
        ok=0;
        for(i=1;i<=n;++i)
        viz[i]=0;
        for(i=1;i<=n;++i)
        if(!st[i]&&cupleaza(i))
        {
            ok=1;
            ++nr;
        }
    }
    g<<2*n-nr<<'\n';
    for(i=1;i<=n;++i)
    if(st[i])
    ok1[i]=1;
    for(i=1;i<=n;++i)
    if(!st[i])
    fa(i);
    for(i=1;i<=n;++i)
    {
        if(ok1[i]&&ok2[i])
        g<<0<<'\n';
        else
        if(!ok1[i]&&ok2[i])
        g<<1<<'\n';
        else
        if(ok1[i]&&!ok2[i])
        g<<2<<'\n';
        else
        g<<3<<'\n';
    }
    return 0;
}