#include <iostream>
#include <stdio.h>
#include <algorithm>
#define NMax 200005
#define MMax 400005
using namespace std;
struct Muchie
{
    int x,y,z;
}Edges[MMax];
int N,M,tata[NMax],rang[NMax],cost,sol;
int Sol[NMax];

void Read()
{
    scanf("%d%d",&N,&M);
    for(int i=1;i<=M;i++)
    {
        scanf("%d%d%d",&Edges[i].x,&Edges[i].y,&Edges[i].z);
    }
}

bool Comp(Muchie a,Muchie b)
{
    return a.z<b.z;
}

int Radacina(int x)
{
    while(tata[x]!=x)
        x=tata[x];
    return x;
}

void Sudeaza(int x,int y)
{
    if(rang[x]>rang[y])
    {
        tata[y]=x;
    }
    else
    {
        tata[x]=y;
    }

    if(rang[x]==rang[y])
        rang[y]++;
}

void Solve()
{
    sort(Edges+1,Edges+M+1,Comp);

    for(int i=1;i<=N;i++)
    {
        tata[i]=i;
    }

    for(int i=1;i<=M;i++)
    {
        int x=Edges[i].x;
        int y=Edges[i].y;
        int radx=Radacina(x);
        int rady=Radacina(y);
        if(radx!=rady)
        {
            Sudeaza(radx,rady);
            cost=cost+Edges[i].z;
            sol++;
            Sol[sol]=i;
        }
    }
}

void Write()
{
    printf("%d\n",cost);
    printf("%d\n",sol);
    for(int i=1;i<=sol;i++)
    {
        printf("%d %d\n",Edges[Sol[i]].x,Edges[Sol[i]].y);
    }
}

int main()
{
    freopen("apm.in","r",stdin);
    freopen("apm.out","w",stdout);
    Read();
    Solve();
    Write();
}