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#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("apm.in");
ofstream g("apm.out");
#define maxn 400003
int ind[maxn],x[maxn],y[maxn],dist[maxn];
int t[100003],rg[100003];
bool use[400003];
int n,m,i,xx,yy,op;
int father(int a)
{
while(t[a])
a=t[a];
return a;
}
int tx,ty,cx;
bool cmp(int i,int j)
{
return dist[i]<dist[j];
}
typedef long long ll;
long long cost,cate;
int main()
{
f>>n;
f>>m;
for(i=1;i<=m;i++)
{
f>>x[i]>>y[i]>>dist[i];
ind[i]=i;
}
sort(ind+1,ind+m+1,cmp);
for(i=1;i<=m;i++)
{
xx=x[ind[i]];
yy=y[ind[i]];
tx=father(xx);
ty=father(yy);
if(tx!=ty)
{
use[i]=1;
cate+=1;
cost+=ll(dist[ind[i]]);
while(t[xx])
{
cx=xx;
xx=t[xx];
t[cx]=tx;
}
if(rg[tx]==rg[ty])
{
rg[tx]+=1;
t[ty]=tx;
}
else
if(rg[tx]>rg[ty])
t[ty]=tx;
else
t[tx]=ty;
}
}
g<<cost<<'\n'<<cate<<'\n';
for(i=1;i<=m;i++)
if(use[i]==1)
g<<x[i]<<" "<<y[i]<<'\n';
return 0;
}