#include <iostream>
#include <fstream>
#include <vector>
#include <cstring>
using namespace std;

#define cout g
#define nmax 100010

ifstream f("2sat.in");
ofstream g("2sat.out");

int n,m,i,a,b,r,st;
vector <int> G[nmax*2],G_t[nmax*2],ctc[nmax];
char x[nmax];
bool viz[2*nmax];
int stack[nmax];

#define G (G+nmax)
#define G_t (G_t+nmax)
#define viz (viz+nmax)
#define foor(i,a,b) for(__typeof(a) i=a;i!=b;++i)

void dfs(int nod)
{
    viz[nod]=true;
    foor(it,G[nod].begin(),G[nod].end())
    if (!viz[*it]) dfs(*it);
    stack[++st]=nod;
}

void dfs_t(int nod)
{
    viz[nod]=false;
    ctc[r].push_back(nod);
    foor(it,G_t[nod].begin(),G_t[nod].end())
    if (viz[*it]) dfs_t(*it);
}

int main()
{
    f>>n>>m;
    memset(x,2,n+1);
    for(i=1; i<=m; ++i)
    {
        f>>a>>b;
        G[-a].push_back(b);
        G[-b].push_back(a);

        G_t[b].push_back(-a);
        G_t[a].push_back(-b);
    }

    for(i=-n; i<=n; ++i)
        if(!viz[i]) dfs(i);

    for(; st; --st)
        if(viz[stack[st]])
        {
            ++r;
            dfs_t(stack[st]);
        }
    bool s=false;
    for(i=1; i<=r; ++i)
    {
        foor(it,ctc[i].begin(),ctc[i].end())
        {
            if(*it<0)
            {
                if(x[-*it]<2) if(x[-*it]!=(!s))
                    {
                        cout<<-1;
                        return 0;
                    }
                    else;
                else x[-*it]=!s;
            }
            else
            {
                 if(x[*it]<2) if(x[*it]!=s)
                    {
                        cout<<-1;
                        return 0;
                    }
                    else;
                else x[*it]=s;
            }
        }
        --r;
        s=!s;
    }
for(i=1;i<=n;++i) cout<<(int)x[i]<<' ';


return 0;
}