#include<fstream>
#include<algorithm>
using namespace std;

ifstream f("lazy.in");
ofstream g("lazy.out");

int N,M,i,j,nr,gx,gy;
int x[200002],y[200002],ind[200002],group[200002];
long long c1[200002],c2[200002];

struct comp
{bool operator()(const int &a, const int &b)const
  {if(c1[a]==c1[b])
    return(c2[a]>c2[b]);
   else
    return(c1[a]<c1[b]);}
};

inline int group_name(int s)
{if(group[s]==s)
   return s;
 group[s]=group_name(group[s]);
 return group[s];  
}

int unite_groups(int a, int b)
{group[group_name(b)]=group_name(a);}

int main()
{f>>N>>M;
for(i=1; i<=M; i++)
  {f>>x[i]>>y[i]>>c1[i]>>c2[i];
   ind[i]=i;}
for(i=1; i<=N; i++)
  group[i]=i;   
sort(ind+1,ind+M+1,comp());   
for(i=1; i<=M; i++)
if(nr<N-1)
  {gx=x[ind[i]];  gy=y[ind[i]];
   if(group_name(gx)!=group_name(gy))
    {unite_groups(gx,gy);
    nr++;
    g<<ind[i]<<endl;}   
   }
else
  break;
f.close();
g.close();  
return 0;}