#include <bits/stdc++.h>
#include <unordered_map>
#define nmax 200007
#define MOD 9901
#define INF 2012345678
#define ll long long
using namespace std;
//#define fin cin
//#define fout cout

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

struct Patru {
	int x, y, cost, viz;
	bool operator < (const Patru w) const {
		return cost < w.cost;
	}
};

int n, m;
Patru a[nmax];
int t[nmax];

int FindRoot(int x)
{
	int y, rad;
	rad = x;
	while (t[rad] != 0)
		rad = t[rad];

	while (x != rad)
	{
		y = t[x];
		t[x] = rad;
		x = y;
	}

	return rad;
}

void Union(int x, int y)
{
	t[y] = x;
}

int Kruskal()
{
	int i, x, y, nrc, costTotal;
	costTotal = 0; nrc = n;

	sort(a + 1, a + m + 1);

	for (i = 1; i <= m && nrc > 1; i++)
	{
		x = FindRoot(a[i].x);
		y = FindRoot(a[i].y);

		if (x != y)
		{
			Union(x, y);
			costTotal += a[i].cost;
			a[i].viz = 1;
			nrc--;
		}
	}

	return costTotal;
}

int main()
{
	int i, j, x, y, c, cnt;
	fin >> n >> m;
	for (i = 1; i <= m; i++)
	{
		fin >> x >> y >> c;
		a[i].x = x; a[i].y = y; a[i].cost = c;
	}

	fout << Kruskal() << "\n";

	cnt = 0;
	for (i = 1; i <= m; i++)
		if (a[i].viz == 1)
			cnt++;

	fout << cnt << "\n";

	for (i = 1; i <= m; i++)
		if (a[i].viz == 1)
			fout << a[i].x << " " << a[i].y << "\n";

	fout.close();
	fin.close();
	return 0;
}