#include<cstdio>
#include<vector>
#define MAX_N 200000
#define MAX_M 400000
using namespace std;

struct elem {
    int x, y, cost;
};

elem v[MAX_M];
int p[MAX_N+1], h[MAX_N+1], n, m, minCost, apmSIZE;
vector<pair<int,int> >apm;

void readGraph() {
    FILE* fin = fopen("apm.in","r");
    fscanf(fin,"%d%d",&n,&m);
    for(int i = 0; i < m; i++)
        fscanf(fin,"%d%d%d",&v[i].x,&v[i].y,&v[i].cost);
    fclose(fin);
}

void quickSort(int p, int q) {
    int b = p, e = q, pivot = v[(p+q)/2].cost;
    while(b <= e) {
        while(v[b].cost < pivot) b++;
        while(v[e].cost > pivot) e--;
        if(b <= e) {
            elem aux = v[b];
            v[b] = v[e];
            v[e] = aux;
            b++;
            e--;
        }
    }
    if(p < e) quickSort(p,e);
    if(b < q) quickSort(b,q);
}

void Init(int n) {
    for(int i = 1; i <= n; i++) {
        p[i] = i;
        h[i] = 1;
    }
}

inline int Find(int x) {
    int r, aux;
    r = x;
    while(p[r] != r)
        r = p[r];
    while(p[x] != r) {
        aux = p[x];
        p[x] = r;
        x = aux;
    }
    return r;
}

void Union(int x, int y, int i) {
    int rx, ry;
    rx = Find(x);
    ry = Find(y);
    if(rx != ry) {
        if(h[rx] < h[ry])
            p[rx] = ry;
        else if(h[rx] > h[ry])
            p[ry] = rx;
        else {
            p[rx] = ry;
            h[ry]++;
        }
        minCost += v[i].cost;
        apm.push_back(make_pair(x,y));
        apmSIZE++;
    }
}

void Kruskal(int n, int m) {
    quickSort(0,m-1);
    Init(n);
    minCost = apmSIZE = 0;
    for(int i = 0; apmSIZE < n - 1; i++)
        Union(v[i].x,v[i].y,i);
}

void printAPM() {
    vector<pair<int,int> >::iterator it;
    FILE* fout = fopen("apm.out","w");
    fprintf(fout,"%d\n%d\n",minCost,apmSIZE);
    for(it = apm.begin(); it != apm.end(); it++)
        fprintf(fout,"%d %d\n",(*it).first,(*it).second);
    fclose(fout);
}

int main() {
    readGraph();
    Kruskal(n,m);
    printAPM();
    return 0;
}