#include<fstream>
#include<vector>
 
using namespace std;
 
int n;
 
vector<int> graph[200005], gt[200005];
 
inline int no(int x){
  if(x > n)
    return x - n;
  return x + n;
}
 
void implying(int x, int y){
  if(x < 0)
    x = -x + n;
  if(y < 0)
    y = -y + n;
  graph[no(x)].push_back(y);
  graph[no(y)].push_back(x);
  gt[x].push_back(no(y));
  gt[y].push_back(no(x));
}
 
vector<int> st;
int impossible, vis[200005], vis2[200005], val[200005];
 
void dfs1(int x){
  vis[x] = 1;
  for(int i = 0; i < graph[x].size(); ++i)
    if(!vis[graph[x][i]])
      dfs1(graph[x][i]);
  st.push_back(x);
}
 
void dfs2(int x){
  if(val[x] == 1)
    impossible = 1;
  val[no(x)] = 1;
  vis2[x] = 1;
  for(int i = 0; i < gt[x].size(); ++i)
    if(!vis2[gt[x][i]])
      dfs2(gt[x][i]);
}
 
int main(){
  ifstream in("2sat.in");
  ofstream out("2sat.out");
 
  int m;
  in >> n >> m;
 
  for(int i = 1; i <= m; ++i){
    int x, y;
    in >> x >> y;
    implying(x, y);
  }
 
  for(int i = 1; i <= 2 * n; ++i)
    if(!vis[i])
      dfs1(i);
 
  for(int i = 2 * n - 1; i >= 0; --i)
    if(!vis2[st[i]] && !vis2[no(st[i])])
      dfs2(st[i]);
 
  if(impossible)
    out << "-1";
  else
    for(int i = 1; i <= n; ++i)
      out << val[i] << " ";
 
  return 0;
}