#include <iostream>
#include <vector>

#define NMax 200005
#define Inf 2000000000
#define v first
#define c second

using namespace std;

vector < pair <int, int> > G[NMax];
int N, APM[NMax], Father[NMax], NHeap, Heap[NMax], Poz[NMax], CostAPM;

void Read ()
{
    freopen ("apm.in", "r", stdin);
    int M;
    scanf ("%d %d", &N, &M);
    for (; M>0; --M)
    {
        int X, Y, Z;
        scanf ("%d %d %d", &X, &Y, &Z);
        G[X].push_back (make_pair (Y, Z));
        G[Y].push_back (make_pair (X, Z));
    }
}

void Print ()
{
    freopen ("apm.out", "w", stdout);
    printf ("%d\n%d\n", CostAPM, N-1);
    for (int i=2; i<=N; ++i)
    {
        printf ("%d %d\n", Father[i], i);
    }
}

inline void Swap (int X, int Y)
{
    int Aux;
    Aux=Poz[Heap[X]];
    Poz[Heap[X]]=Poz[Heap[Y]];
    Poz[Heap[Y]]=Aux;
    Aux=Heap[X];
    Heap[X]=Heap[Y];
    Heap[Y]=Aux;
}

void Percolate (int X)
{
    int F=(X>>1);
    if (F>0 and APM[Heap[X]]<APM[Heap[F]])
    {
        Swap (X, F);
        Percolate (F);
    }
}

void Sift (int X)
{
    int Son=(X<<1);
    if (Son+1<=NHeap and APM[Heap[Son+1]]<APM[Heap[Son]])
    {
        ++Son;
    }
    if (Son<=NHeap and APM[Heap[Son]]<APM[Heap[X]])
    {
        Swap (X, Son);
        Sift (Son);
    }
}

void Delete (int X)
{
    Swap (X, NHeap);
    Poz[Heap[NHeap]]=0;
    Heap[NHeap]=0;
    --NHeap;
    Sift (X);
}

void Initialize (int Start)
{
    NHeap=N;
    for (int i=1; i<=N; ++i)
    {
        APM[i]=Inf;
        Heap[i]=Poz[i]=i;
    }
    APM[Start]=0;
    Swap (1, Start);
}

void Prim (int Start)
{
    Initialize (Start);
    while (NHeap>0)
    {
        int X=Heap[1];
        Delete (1);
        for (unsigned i=0; i<G[X].size (); ++i)
        {
            int V=G[X][i].v;
            int C=G[X][i].c;
            if (Poz[V]!=0 and C<APM[V])
            {
                APM[V]=C;
                Father[V]=X;
                Percolate (Poz[V]);
            }
        }
    }
}

int main()
{
    Read ();
    Prim (1);
    for (int i=1; i<=N; ++i)
    {
        CostAPM+=APM[i];
    }
    Print ();
    return 0;
}