#include <iostream>
#include <fstream>
#include <queue>
using namespace std;
ifstream f("mergeheap.in");
ofstream g("mergeheap.out");
priority_queue <unsigned int> h[101];
int N,Q,operatie,a,b,i;
int main()
{
    f>>N>>Q;
    for(i=0; i<Q; ++i)
    {
        f>>operatie;
        if(operatie==1)
        {
            f>>a>>b;
            h[a].push(b);
        }
        if(operatie==2)
        {
            f>>a;
            g<<h[a].top()<<"\n";
            h[a].pop();
        }
        if(operatie==3)
        {
            f>>a>>b;
            while(!h[a].empty())
            {
                h[b].push(h[a].top());
                h[a].pop();
            }
        }
    }
    return 0;
}