#include<bits/stdc++.h>
using namespace std;
const int MAXN=1e5+100;
int x,y,m;
set<int> s[MAXN];
void solve(){
    mt19937 rnd(time(0));
    cin >> x >> y >> m;
    for (int i=1; i<=x; i++){
        s[i].clear();
    }
    for (int i=1,u,v; i<=m; i++) {
        cin >> u >> v;
        s[u].insert(v);
    }
    while (1) {
        vector<int>ans1,ans2,f(y+1);
        for (int i=1; i<=y; i++) {
            f[i]=rnd()%2;
            if (f[i]) {
                ans2.push_back(i);
            }
        }
        for (int i=1; i<=x; i++) {
            int cnt=0;
            for (int v : s[i]) {
                cnt^=f[v];
            }
            if (cnt) {
                ans1.push_back(i);
            }
        }
        if (ans1.size()+ans2.size()>=(x+y+1)/2) {
            cout << ans1.size() << " " << ans2.size() << "\n";
            for (int v : ans1) {
                cout << v << " ";
            }
            cout << "\n";
            for (int v : ans2) {
                cout << v << " ";
            }
            cout << "\n\n";
            return;
        }
    }
}
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    int T;
    cin >> T;
    while (T--) {
        solve();
    }

    return 0;
}