#include<cstdio>
#include<algorithm>
using namespace std;
int j,xx1,yy1,n,m,s,i,nr,t[200002],poz[200002],h[200002];
struct str
{
    int x,y;
    short c;
};
str a[400002];
bool cmp(str a,str b)
{
    return a.c<b.c;
}
int tata(int x)
{
    if(t[x]!=x) t[x]=tata(t[x]);
    return t[x];
}
int main()
{
freopen("apm.in","r",stdin);
freopen("apm.out","w",stdout);
scanf("%d",&n);
scanf("%d",&m);
for(i=1;i<=n;i++)
{
    h[i]=1;
    t[i]=i;
}
for(i=1;i<=m;i++)
    scanf("%d %d %d",&a[i].x,&a[i].y,&a[i].c);
sort(a+1,a+m+1,cmp);
for(i=1;i<=m;i++)
{
    xx1=tata(a[i].x);
    yy1=tata(a[i].y);
    if(xx1!=yy1)
    {
        if(h[xx1]<h[yy1]) t[xx1]=yy1;
        else t[yy1]=xx1;
        if(h[xx1]==h[yy1]) h[yy1]++;
        nr++;
        poz[nr]=i;
        s=s+a[i].c;
        if(nr==n-1) break;
    }
}
printf("%d\n",s);
printf("%d\n",nr);
for(i=1;i<=nr;i++)
    printf("%d %d\n",a[poz[i]].x,a[poz[i]].y);
return 0;
}