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#include <cstdio>
#include <algorithm>
#include <vector>
#include <queue>
#include <map>
using namespace std;
typedef long long int LL;
struct wp {
	int t[1003];
	int l;
	LL hasz[1003];
}t[1003];
struct ciag {
	vector <int> v;
	int wyn;
};
LL pot[1003], hsz[1003];
int wz[1003];
const LL lp=503;
const LL mod=(LL)1e9+696969;
int P[2015];
queue <ciag> q, pq;
vector <int> v;
LL rhsz (int a, int b)
	{
	LL odp=(hsz[b]-(hsz[a-1]*pot[b-a+1])%mod)%mod;
	if (odp<0) odp+=mod;
	return odp;
	}
LL rthasz (int a, int b, int i)
	{
	LL odp=(t[i].hasz[b]-(t[i].hasz[a-1]*pot[b-a+1])%mod)%mod;
	if (odp<0) odp+=mod;
	return odp;
	}
void view ()
	{
	for (vector<int>::iterator it=v.begin(); it!=v.end(); it++)
		printf ("%d ", *it);
	printf ("\n");
	}
map<LL, int> mp;
int main ()
{
int n, m, x, y, dl, wyn, po, ko, sr, szuk, dozuc, dlg;
pot[0]=1;
for (int i=1; i<=1001; i++)
	pot[i]=(pot[i-1]*lp)%mod;
scanf ("%d%d", &n, &m);
for (int i=1; i<=n; i++)
	{
	scanf ("%d", &t[i].l);
	for (int j=1; j<=t[i].l; j++)
		{
		scanf ("%d", &t[i].t[j]);
		t[i].hasz[j]=(t[i].hasz[j-1]*lp+t[i].t[j])%mod;
		}
	}
/*for (int i=1; i<=n; i++)
	{
	printf ("%d : ", i);
	for (int j=1; j<=t[i].l; j++)
		printf ("%lld ", t[i].hasz[j]);
	printf ("\n");
	}*/
for (int i=1; i<=m; i++)
	{
	scanf ("%d", &x);
	v.push_back(x);
	}
ciag pom; pom.v=v; pom.wyn=1;
q.push(pom);
v.clear();
int dzies=10;
while (!q.empty())
	{
	wyn=q.front().wyn;
	dl=q.front().v.size();
	v=q.front().v;
	for (int i=0; i<dl; i++)
		wz[i+1]=v[i];
	//printf ("wynik : {%d} ", wyn);
	for (int i=1; i<=dl; i++)
		{
		hsz[i]=(hsz[i-1]*lp+wz[i])%mod;
		//printf ("%d ", wz[i]);
		}
	/*printf ("\n");
	for (int i=1; i<=dl; i++)
		printf ("%lld ", hsz[i]);*/
	if (dl==1 && q.front().v[0]==1)
		{
		printf ("%d", wyn);
		return 0;
		}
	q.pop();
	if (mp[hsz[dl]]==1)
		{
		//printf ("blad\n");
		continue;
		}
	//printf ("\n");
	mp[hsz[dl]]=1;
	for (int i=1; i<=n; i++)
		{
		for (int j=dl; j<=t[i].l; j++)
			if (rthasz(j-dl+1, j, i)==hsz[dl])
				{
				v.clear(); v.push_back(i);
				pom.v=v; pom.wyn=wyn+1;
				q.push(pom);
				}
		}
	//printf ("%lld", hsz[dl]);
	for (int i=1; i<=n; i++)
		{
		po=0; ko=min(t[i].l, dl);
		sr=ko;
		while (sr>0)
			{
			//sr=(po+ko)/2+1;
			//printf ("%d %d %d %d %d %d %lld %lld\n", i, sr, 1, sr, t[i].l-sr+1, t[i].l, rhsz(1, sr), rthasz(t[i].l-sr+1, t[i].l, i));
			if (rhsz(1, sr)==rthasz(t[i].l-sr+1, t[i].l, i))
				break;
			sr--;
			}
		po=sr;
		//printf ("pocz : %d %d\n", i, po);
		if (po==0) continue;
		v.clear();
		v.push_back(i); pom.v=v; pom.wyn=po+1;
		pq.push(pom);
		//printf ("zaczynamy : {%d} ", po+1); view();
		while (!pq.empty())
			{
			szuk=pq.front().wyn;
			v=pq.front().v;
			//printf ("w srodku : "); view();
			pq.pop();
			if (szuk>dl) continue;
			for (int j=1; j<=n; j++)
				{
				dlg=min(dl-szuk+1, t[j].l);
				//printf ("%d %d %d %d %d %lld %lld\n", j, szuk, szuk+dlg-1, 1, dlg, rhsz(szuk, szuk+dlg-1), rthasz(1, dlg, j));
				if (rhsz(szuk, szuk+dlg-1)==rthasz(1, dlg, j))
					{
					v.push_back(j);
					dozuc=szuk+dlg;
					pom.v=v;
					//printf ("pushuje : "); view();
					if (dozuc>dl)
						{
						pom.wyn=wyn+1;
						q.push(pom);
						//printf ("q\n");
						}
					else
						{
						pom.wyn=dozuc;
						pq.push(pom);
						//printf ("pq\n");
						}
					v.pop_back();
					}
				}
			}
		}
	}
printf ("-1");
return 0;
}