#include <bits/stdc++.h>
using namespace std;
vector<int> v[100005];
int visited[100005] = {0};
int cv[100005];
int answer = 1;
void cdfs(int root, int prev) {
  if (visited[root] == 1) {
    if (cv[root] != prev) {
      answer = 0;
    }
    return;
  }
  visited[root] = 1;
  cv[root] = prev;
  int i;
  for (i = 0; i < v[root].size(); i++) {
    cdfs(v[root][i], 1 - prev);
  }
}
int power2(int x, unsigned int y) {
  int res = 1;
  x = x;
  while (y > 0) {
    if (y & 1) res = (res * x);
    y = y >> 1;
    x = (x * x);
  }
  return res;
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int n, m;
  cin >> n >> m;
  int i;
  for (i = 0; i < m; i++) {
    int x, y;
    cin >> x >> y;
    v[x].push_back(y);
    v[y].push_back(x);
  }
  for (i = 1; i <= n; i++) {
    cv[i] = -1;
  }
  for (i = 1; i <= n; i++) {
    if (cv[i] == -1) {
      cdfs(i, 0);
    }
  }
  if (answer == 0)
    cout << "-1";
  else {
    int counta = 0;
    int countb = 0;
    vector<int> va;
    vector<int> vb;
    for (i = 1; i <= n; i++) {
      if (cv[i] == 1) {
        counta++;
        va.push_back(i);
      } else if (cv[i] == 0) {
        countb++;
        vb.push_back(i);
      }
    }
    cout << counta << "\n";
    for (i = 0; i < va.size(); i++) {
      cout << va[i] << " ";
    }
    cout << "\n";
    cout << countb << "\n";
    for (i = 0; i < vb.size(); i++) {
      cout << vb[i] << " ";
    }
  }
  return 0;
}
