#include <stdio.h>
#include <algorithm>
using namespace std;

struct muchie{
    int x,y,c;
};
muchie v[30000];
struct muchii{
    int x,y;
};
muchii w[30000];
int n,i,j,m,k,ct,x,y,l[30000],q;

void initializare ()
{
    int i;
    for(i=1;i<=n;i++) l[i]=i;
}

void citire ()
{
   	int i=0,x,y,c;
   	scanf("%d %d\n", &n, &m);
	for (i=1;i<=m;++i)
	{
        scanf("%d %d %d\n", &x, &y, &c);
		v[i].x=x;v[i].y=y;
		v[i].c=c;
	}
}

void sortare ()
{
    int i,j;
    muchie aux;
    for(i=1;i<m;i++)
        for(j=i+1;j<=m;j++)
            if(v[i].c>v[j].c)
            {
                aux=v[i];
                v[i]=v[j];
                v[j]=aux;
            }
}

int main ()
{
    freopen("apm.in","r",stdin);
    freopen("apm.out","w",stdout);
    citire ();
    sortare ();
    initializare();
    i=0;j=0;k=0; ct=0;
	while(k<n-1)
	{
		if(l[v[i].x]!=l[v[i].y])
		{
			k++;
			ct=ct+v[i].c;
			w[i].x=v[i].x; w[i].y=v[i].y;
			x=l[v[i].y];
			y=l[v[i].x];
			for(j=1;j<=n;j++)
				if(l[j]==x) l[j]=y;
		}
        i++;
	}
	//for(i=1;i<=m;i++) printf("%d %d %d\n", v[i].x, v[i].y, v[i].c);
    printf("%d\n%d\n", ct, k);
    for(i=1;i<=n-1;i++) printf("%d %d\n", w[i].y, w[i].x);
    return 0;
}