#include<algorithm>
#include<cstdio>
using namespace std;
int aux,j,k,s,x,y,c,i,n,m,b[400009],aa[400009],bb[400009];
struct nod
{
    int x,y,c;
};
nod a[400009];
bool cmp(nod a,nod b)
{
    if(a.c>b.c) return 0;
    return 1;
}
int main()
{
    freopen("apm.in","r",stdin);
    freopen("apm.out","w",stdout);
    scanf("%d%d",&n,&m);
    for(i=1;i<=m;i++)
    {
        scanf("%d%d%d",&x,&y,&c);
        a[i].x=x;
        a[i].y=y;
        a[i].c=c;
    }
    sort(a+1,a+m+1,cmp);
    for(i=1;i<=n;i++)
        b[i]=i;
    for(i=1;i<=m;i++)
    {
        if(i==9)
            i=9;
        if(b[a[i].y]!=b[a[i].x])
        {
            k++;
            aa[k]=a[i].x;
            bb[k]=a[i].y;
            aux=b[a[i].x];
            for(j=1;j<=n;j++)
            {
                if(b[j]==aux)
                    b[j]=b[a[i].y];
            }
            s=s+a[i].c;
        }
        if(k==n-1) break;
    }
    printf("%d\n%d\n",s,k);
    for(i=1;i<=k;i++)
    {
        printf("%d %d\n",aa[i],bb[i]);
    }
    return 0;
}