#include <bits/stdc++.h>

using namespace std;

using Pii = pair<long long, long long>;

#define int long long

mt19937_64 rnd(time(0));

const int N = 1e5 + 5;

int t, x, y, m, vis[N];

set<Pii> s;

vector<int> g[N];

void Solve() {
  cin >> x >> y >> m;
  for (int i = 1, u, v; i <= m; i++) {
    cin >> u >> v;
    s.insert({u, v});
  }
  while (!s.empty()) {
    auto cur = *s.begin();
    s.erase(s.begin());
    g[cur.first].push_back(cur.second);
  }
  for (int _ = 1; _ <= 1145141919810; _++) {
    int cnt = 0;
    for (int i = 1; i <= y; i++) {
      vis[i] = rnd() % 2;
      cnt += vis[i];
    }
    for (int i = 1; i <= x; i++) {
      int tmp = 0;
      for (auto v : g[i]) {
        tmp += vis[v];
      }
      if (tmp % 2 == 1) {
        cnt++;
      }
    }
    if (cnt >= (x + y) / 2) {
      break;
    }
  }
  vector<int> ans1, ans2;
  for (int i = 1; i <= x; i++) {
    if (vis[i] == true) {
      ans1.push_back(i);
    }
  }
  for (int i = 1; i <= x; i++) {
    int tmp = 0;
    for (auto v : g[i]) {
      tmp += vis[v];
    }
    if (tmp % 2 == 1) {
      ans2.push_back(i);
    }
  }
  cout << ans1.size() << " " << ans2.size() << "\n";
  for (auto cur : ans1) {
    cout << cur << " ";
  }
  cout << "\n";
  for (auto cur : ans2) {
    cout << cur << " ";
  }
  cout << "\n";
  cout << "\n";
}

signed main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cin >> t;
  while (t--) {
    Solve();
  }
  return 0;
}