#include <fstream>
#define DIM 1032
using namespace std;

int n,m,k,val,a[DIM],b[DIM],c[DIM],v[DIM];

int main()
{
    ifstream fin("balanta.in");
    ofstream fout("balanta.out");
    fin>>n>>m;
    int counter=0;
    for(int i=1;i<=m;i++) {
        fin>>k;
        for(int j=1;j<=k;j++)
            fin>>a[j];
        for(int j=1;j<=k;j++)
            fin>>b[j];
        fin>>val;
        if(val==0) {
            for(int j=1;j<=k;j++)
                c[a[j]]=c[b[j]]=-1;
        }
        else {
            counter++;

            for(int j=1;j<=k;j++) {
                if(val==1) val=2;
                else val=1;
                if(c[a[j]]>=0) {
                    if(v[a[j]]==val||v[a[j]]==0)
                        c[a[j]]++,v[a[j]]=val;
                    else
                        c[a[j]]=-1;
                }
                if(val==1) val=2;
                else val=1;
                if(c[b[j]]>=0) {
                    if(v[b[j]]==val||v[b[j]]==0)
                        c[b[j]]++,v[b[j]]=val;
                    else
                        c[b[j]]=-1;
                }
            }
        }
    }
    int coin=0;
    for(int i=1;i<=n;i++) {
        if(c[i]!=counter)
            continue;
        if(coin==0)
            coin=i;
        else
            coin=-1;
    }
    if(coin==-1)
        fout<<"0";
    else
        fout<<coin;
    return 0;
}