#include <bits/stdc++.h>
using namespace std;
const int maxn = 100003;
int n, m, h, t;
vector<int> v[maxn];
vector<pair<int, int> > ve;
bool vis[maxn];
void getans(int a, int b) {
  cout << "YES" << '\n';
  cout << a + 1 << ' ' << b + 1 << '\n';
  set<int> sa, sb;
  vector<int> va, vb, vc;
  for (int i = 0; i < v[a].size(); i++)
    if (v[a][i] != b) sa.insert(v[a][i]);
  for (int i = 0; i < v[b].size(); i++)
    if (v[b][i] != a) sb.insert(v[b][i]);
  set<int>::iterator itr;
  for (itr = sa.begin(); itr != sa.end(); itr++) {
    int cur = *itr;
    if (sb.find(cur) == sb.end())
      va.push_back(cur + 1);
    else
      vc.push_back(cur + 1);
  }
  for (itr = sb.begin(); itr != sb.end(); itr++) {
    int cur = *itr;
    if (sa.find(cur) == sa.end()) vb.push_back(cur + 1);
  }
  while (va.size() < h) {
    int sz = vc.size() - 1;
    va.push_back(vc[sz]);
    vc.pop_back();
  }
  while (vb.size() < t) {
    int sz = vc.size() - 1;
    vb.push_back(vc[sz]);
    vc.pop_back();
  }
  for (int i = 0; i < h; i++) {
    cout << va[i] << ' ';
  }
  cout << '\n';
  for (int i = 0; i < t; i++) {
    cout << vb[i] << ' ';
  }
  cout << '\n';
}
bool isok(int a, int b) {
  int dega = 0, degb = 0, deg = 0;
  for (int i = 0; i < v[a].size(); i++) {
    int cur = v[a][i];
    if (cur != b) {
      dega++;
      deg++;
      vis[cur] = true;
    }
  }
  for (int i = 0; i < v[b].size(); i++) {
    int cur = v[b][i];
    if (cur != a) {
      degb++;
      if (!vis[cur]) deg++;
    }
  }
  memset(vis, false, sizeof(vis));
  if (dega >= h && degb >= t && deg >= (h + t))
    return true;
  else
    return false;
}
int main() {
  cin >> n >> m >> h >> t;
  for (int i = 0; i < m; i++) {
    int a, b;
    cin >> a >> b;
    a--;
    b--;
    if (v[a].size() < 202) v[a].push_back(b);
    if (v[b].size() < 202) v[b].push_back(a);
    ve.push_back(pair<int, int>(a, b));
  }
  for (int i = 0; i < ve.size(); i++) {
    int a = ve[i].first, b = ve[i].second;
    if (isok(a, b)) {
      getans(a, b);
      return 0;
    }
    if (isok(b, a)) {
      getans(b, a);
      return 0;
    }
  }
  cout << "NO" << '\n';
  return 0;
}
