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

struct edge {
    int x, y, c;
};

edge v[MAX_M];

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

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

inline bool cmp(edge a, edge b) {
    return a.c < b.c;
}

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 ind) {
    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]++;
        }
        apm.push_back(make_pair(x,y));
        minCost += v[ind].c;
        apmSIZE++;
    }
}

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

void printAPM() {
    FILE* fout = fopen("apm.out","w");
    fprintf(fout,"%d\n%d\n",minCost,n-1);
    for(auto i : apm)
        fprintf(fout,"%d %d\n",i.first,i.second);
    fclose(fout);
}

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