#include <bits/stdc++.h>

using namespace std;

ifstream fin ("2sat.in");
ofstream fout ("2sat.out");

const int N = 2e5 + 2;
int n, m;
vector<int>G[N], Gr[N];
vector<vector<int> > ctc;
bool viz[N];
int comp[N], val[N];

int valNod (int x) {
  if (x < 0)
    return -x + n;
  return x;
}
int neg (int x){
  if (x > n)
    return x - n;
  return x + n;
}

stack<int>st;

void dfs1 (int x) {
  viz[x] = 1;
  for (auto it : G[x]) {
    if (!viz[it])
      dfs1(it);
  }
  st.push(x);
}

vector<int>c;
int cnt;

void dfs2 (int x) {
  viz[x] = 1;
  for (auto it : Gr[x]) {
    if (!viz[it])
      dfs2(it);

  }
  c.push_back(x);
    comp[x] = cnt;
}


int main()
{
  fin >> n >> m;
  for (int i = 1; i <= m;i++) {
    int x, y;
    fin >> x >> y;
    x = valNod(x);
    y = valNod(y);
    G[neg(x)].push_back(y);
    G[neg(y)].push_back(x);
    Gr[y].push_back(neg(x));
    Gr[x].push_back(neg(y));
  }
  for (int i = 1; i <= 2 * n; i++)
    if (!viz[i])
      dfs1(i);
  memset(val, -1, sizeof(val));
  memset(viz, 0, sizeof(viz));
  while (!st.empty()) {
    int nod = st.top();
    st.pop();
    if (!viz[nod]) {
      c.clear();
      cnt++;
      dfs2(nod);
      ctc.push_back(c);
    }
  }
  for (auto c : ctc) {
    bool ok = 1;
    for (auto it : c) {
      if (comp[it] == comp[neg(it)])
        ok = 0;
    }
    if (!ok) {
      fout << -1;
      return 0;
    }
    int a = -1;
    for (auto it : c) {
      if (val[it] != -1)
        a = val[it];
      if (a != -1 && val[it] != -1 && val[it] != a)
        ok = 0;
    }
    if (!ok) {
      fout << -1;
      return 0;
    }
    if (a == -1)
      a = 1;
    for (auto it : c) {
      val[it] = a;
      if (val[neg(it)] != -1 && val[neg(it)] != 1 - a)
        ok = 0;
      val[neg(it)] = 1 - a;
    }
    if (!ok) {
      fout << -1;
      return 0;
    }
  }
  for (int i = 1; i <= n; i++)
    fout << val[i] << " ";
  return 0;
}