#include<iostream>
#include<cstdio>
#include<cstring>
#include<cmath>
#include<algorithm>
#include<string.h>
#include<queue>
#include<vector>
#define maxint 999999999
#define MAXN 10005
#define ll long long
using namespace std;

int n,m,k,flag,num;
ll sum;
int Mark[MAXN],st[MAXN],vis[MAXN];

struct Q{
    char name[25];
    int val;
};

bool operator <(const Q &x,const Q &y){
    int Min=min(strlen(x.name),strlen(y.name));
    if(x.val!=y.val)
        return  x.val>y.val;
    for(int i=0;i<Min;i++){
        if(x.name[i]!=y.name[i])
            return x.name[i]<y.name[i];
    }
}

int main()
{
    int l,a,b,c,d;
    char str[20];

    while(scanf("%d %d",&n,&m)!=EOF){
        Q z;
        priority_queue<Q>q[MAXN];
        for(int i=1;i<=n;i++){
            scanf("%d",&l);
            for(int j=1;j<=l;j++){
                scanf("%s %d",z.name,&z.val);
                q[i].push(z);
            }
        }
        for(int i=1;i<=m;i++){
            scanf("%s",str);
            if(strlen(str)==4){
             scanf("%d %d",&a,&b);
             while(!q[b].empty()){
                 q[a].push(q[b].top());
                 q[b].pop();
             }
            }
            else if(strlen(str)==6){
                scanf("%d",&c);
                printf("%s\n",q[c].top().name);
                q[c].pop();
            }
            else if(strlen(str)==5){
                Q w;
                scanf("%d",&d);
                scanf("%s %d",w.name,&w.val);
                q[d].push(w);
            }
        }
        for(int i=1;i<n;i++){
            while(!q[i].empty()){
                q[i].pop();
            }
        }
    }return 0;
}