/*
http://www.infoarena.ro/problema/apm
Se determina un arbore partial minim.
Fata de varianta de 70 de p, avem ??.
*/

#include <fstream>
#include <algorithm>

#define LIM_M 400001
#define LIM_N 200001

using namespace std;

ifstream fin("apm.in");
ofstream fout("apm.out");

struct muchie {
  int inc; int sf; int cost;
};

muchie sm[LIM_M], arbore[LIM_M];
int n, m, nms, csfm, comp[LIM_N], Rank[LIM_N],j, ca;

void citire () {
  int i;

  fin >> n >> m;
  for (i = 1; i <= m; i++)
    fin >> sm[i].inc >> sm[i].sf >> sm[i].cost;
}

void initcomp () {
  int i;

  for (i = 1; i <= n; i++)
    comp[i] = i;
}

bool cmp (muchie a, muchie b) {
  return a.cost < b.cost;
}

int FindSet (int nod) {
  while (comp[nod] != nod)
    nod = comp[nod];
  return comp[nod];
}

void Union (int r1, int r2) { // Se reunesc multimile reprezentate de r1 si r2.
  if (Rank[r1] > Rank[r2])
    comp[r2] = r1;
  else {
    comp[r1] = r2;
    if (Rank[r1] == Rank[r2])
      Rank[r2]++;
  }
}

void rezultat () {
  fout << ca << '\n' << n - 1 << '\n';
  for (int i = 1; i <= nms; i++) // pentru toate muchiile selectate
    fout << arbore[i].inc << ' ' << arbore[i].sf << '\n';
}

int main () {
  int i;

  citire();
  initcomp();
  sort(sm + 1, sm + m + 1, cmp);
  for (i = 1; nms <= n-2; i++) { // Se vor selecta n-1 muchii.
    if (FindSet(sm[i].inc) != FindSet(sm[i].sf)) { // Extremitatile muchiei curente sunt in componente conexe diferite.
      nms++; // Selectam inca o muchie.
      arbore[nms] = sm[i]; // Retinem muchia in arbore.
      ca += arbore[nms].cost; // Actualizam costul arborelui.
      Union(FindSet(sm[i].inc), FindSet(sm[i].sf));
    }
  }
  rezultat();
}