#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;

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

const int n_Max = 2e5 + 1;
const int m_Max = 4e5 + 1;

int n, m, cost;

struct muchii
{
    int x, y, c;
} a[m_Max];

vector <pair <int, int>> b(1);
vector <int> tata(n_Max, -1), dim(n_Max, 1); 

void read()
{
    fin >> n >> m;
    for (int i = 1; i <= m; ++i)
        fin >> a[i].x >> a[i].y >> a[i].c;
}

int find_set(int x)
{
    if (tata[x] == -1)
        return x;
    return tata[x] = find_set(tata[x]);
}

void sets_union(int x, int y)
{
    if (dim[x] < dim[y])
        swap(x, y);
    dim[x] += dim[y];
    tata[y] = x; 
}

bool comp(muchii a, muchii b)
{
    return a.c < b.c;
}

void kruskal()
{
    sort(a + 1, a + 1 + m, comp);

    for (int i = 1; i <= m; ++i)
    {
        int x = find_set(a[i].x);
        int y = find_set(a[i].y);
        if (x != y)
        {
            sets_union(x, y);
            cost += a[i].c;
            b.push_back({a[i].x, a[i].y});
        }
    }
}

void print()
{
    fout << cost << "\n" << n - 1 << "\n";
    for (int i = 1; i < n; ++i)
        fout << b[i].first << " " << b[i].second << "\n";
}

int main()
{
    read();
    kruskal();
    print();

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