#include<bits/stdc++.h>
using namespace std;
int connections[1024][1024];
int n,k;
void swapConnections(int k)
{
    for(int i=0;i<n;i++)
        if(connections[k][i]==1){connections[k][i]=2;connections[i][k]=1;}
        else if(connections[k][i]==2){connections[k][i]=1;connections[i][k]=2;}
}
int check()
{
    for(int i=0;i<n;i++)
    {
        bool flag=true;
        for(int j=0;j<n;j++)
            if(connections[i][j]==2)flag=false;
        if(flag)return i;
    }
    return -1;
}
int main()
{
    ifstream in("hub.in");
    ofstream out("hub.out");
    in>>n>>k;
    for(int i=1;i<=n*(n-1)/2;i++)
    {
        int u,v;
        in>>u>>v;
        connections[u][v]=1;
        connections[v][u]=2;
    }
    for(int i=1;i<=k;i++)
    {
        int queries;
        in>>queries;
        for(int i=1;i<=queries;i++)
        {
            int q;
            in>>q;
            swapConnections(q);
        }
        out<<check()<<endl;
    }
}