#include <bits/stdc++.h>

using namespace std;
ifstream fin("mergeheap.in");
ofstream fout("mergeheap.out");
int n, tt;

struct Iris {
    priority_queue<int> pq;
}v[103];

int main()
{
    fin >> n >> tt;
    while(tt--) {
        int tip; fin >> tip;
        if(tip == 1) {
            int m, x; fin >> m >> x;
            v[m].pq.push(x);
        }
        else if(tip == 2) {
            int m; fin >> m;
            fout << v[m].pq.top() << '\n';
            v[m].pq.pop();
        }
        else {
            int a, b; fin >> a >> b;
            while(!v[b].pq.empty()) {
                v[a].pq.push(v[b].pq.top());
                v[b].pq.pop();
            }
        }
    }

    return 0;
}