#include <iostream>
#include <fstream>
#include <vector>
#include <queue>

using namespace std;

struct muchie {
    int from, to, cost;
};

class comp {
public:
    bool operator()(muchie a, muchie b) {
        return a.cost > b.cost;
    }
};

ifstream f("apm.in");
ofstream g("apm.out");

int n, m, a, b, c;
bool vizitat[200001];
vector<pair<int, int> > graph[200001];
vector<pair<int, int> > rez;
priority_queue<muchie, vector<muchie>, comp> PQ;

void rezolvare() {
    for (auto &v:graph[1])
        PQ.push({1, v.first, v.second});
    muchie sus;
    int cost = 0;
    while (!PQ.empty()) {
        sus = PQ.top();
        PQ.pop();
        if (!vizitat[sus.to]) {
            cost += sus.cost;
            rez.emplace_back(sus.from, sus.to);
            vizitat[sus.from] = vizitat[sus.to] = 1;
            for (auto &v:graph[sus.to]) {
                if (!vizitat[v.first]) {
                    PQ.push({sus.to, v.first, v.second});
                }
            }
        }
    }
    g << cost << '\n';
    g << n - 1 << '\n';
    for (auto &v:rez)
        g << v.first << ' ' << v.second << '\n';
}
void citire(){
    f >> n >> m;
    for (int i = 1; i <= m; ++i) {
        f >> a >> b >> c;
        graph[a].emplace_back(b, c);
        graph[b].emplace_back(a, c);
    }
}


int main() {
    citire();
    rezolvare();
    return 0;
}