#include <bits/stdc++.h>

using namespace std;

const int N = 1e5 + 10;

int T, x, y, m;
bool f[N], vis[N];
vector<int> g[N];

mt19937 rnd(time(0));

void Solve() {
    cin >> x >> y >> m;
    while (m--) {
        int u, v; cin >> u >> v;
        g[u].push_back(v);
    }
    while (1) {
        int ct = 0;
        for (int i = 1; i <= y; i++) {
            f[i] = rnd() % 2, ct += f[i];
        }
        for (int i = 1; i <= x; i++) {
            int cnt = 0;
            for (int j : g[i]) cnt += f[j];
            if (cnt % 2) ct++, vis[i] = 1;
        }

        if (ct >= (x + y + 1) / 2) {
            vector<int> p, q;
            for (int i = 1; i <= x; i++) {
                if (vis[i]) p.push_back(i);
            }
            for (int i = 1; i <= y; i++) {
                if (f[i]) q.push_back(i);
            }
            cout << p.size() << ' ' << q.size() << '\n';
            for (int x : p) cout << x << ' ';
            cout << '\n';
            for (int x : q) cout << x << ' ';
            cout << '\n';
            break;
        }
        fill(vis + 1, vis + x + 1, 0);
    }
    for (int i = 1; i <= x; i++) g[i].clear();
}

int main() {
    ios::sync_with_stdio(0), cin.tie(0);
    cin >> T;
    while (T--) Solve();
    return 0;
}
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