#include <iostream>
#include <cstdio>
#include <cmath>
using namespace std;
int main(){
	freopen ("cowroute.in","r",stdin);
	freopen ("cowroute.out","w",stdout);
	int a,b,c,d,e,f,g,h[10000],i,j,k,l,m,n,o,p;
	cin>>a>>b>>c;
	k=10000;
	for (d=1;d<=c;d++)
	{
		cin>>e>>f;
		for (g=1;g<=f;g++)
		{
			cin>>h[g];
			if (h[g]==a)
			{
				i=g;
			}
			if (h[g]==b)
			{
				j=g;
			}
		}
		if (i<j&&k>e)
		{
			k=e;
		}
	}
	if (k==0)
	{
		cout<<-1;
		return 0;
	}
	cout<<k;
	return 0;
}