#include <iostream>
#include <cstdio>
#include <algorithm>

using namespace std;

const char iname[] = "lazy.in";
const char oname[] = "lazy.out";
const int nmax = 200005;

int i, n, m, father[nmax];

struct muchie
{
	int nod1, nod2;
	int cl1, cl2, nr;
}mc[nmax];


struct cmp
{
	bool operator()(const muchie &a, const muchie &b)const
	{
		if(a.cl1 < b.cl1)
			return 1;
		else
			if(a.cl1 == b.cl1)
			{
				if(a.cl2 > b.cl2)
					return 1;
				return 0;
			}
		else
			return 0;
	}
};

int tata(int nod)
{
	if(nod == father[nod])
		return nod;
	father[nod] = tata(father[nod]);
	return father[nod];
}

void krusk()
{
	for(i = 1; i <= n; i ++)
		father[i] = i;
	sort(mc + 1, mc + m + 1, cmp());
	for(i = 1; i <= m; i ++)
	{
		if(tata(mc[i].nod1) != tata(mc[i].nod2))
		{
			printf("%d\n", mc[i].nr);
			father[tata(mc[i].nod1)] = father[tata(mc[i].nod2)];
		}
	}
}

int main()
{
	freopen(iname, "r", stdin);
	freopen(oname, "w", stdout);
	scanf("%d %d", &n, &m);
	for(i = 1; i <= m; i ++)
	{
		scanf("%d %d %d %d", &mc[i].nod1, &mc[i].nod2, &mc[i].cl1, &mc[i].cl2);
		mc[i].nr = i;
	}
	krusk();
	return 0;
}