#include <bits/stdc++.h>
#define MOD 1000000007
using namespace std;

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

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

elem v[200001],sol[200001];

int n,m,dim[200001],tata[200001];

inline bool cmp(const elem &a, const elem &b)
{
    return a.c<b.c;
}

int tata_multime(int x)
{
    if (x!=tata[x])
        x=tata_multime(tata[x]);
    return tata[x];
}

void unire(int x, int y)
{
    x=tata_multime(x);
    y=tata_multime(y);
    if (dim[y]>dim[x])
    {
        tata[x]=y;
        dim[y]+=dim[x];
    }
    else
    {
        tata[y]=x;
        dim[x]+=dim[y];
    }
}

int main()
{int i,rez=0,k=0;
    f>>n>>m;
    for (i=1;i<=m;i++)
        f>>v[i].x>>v[i].y>>v[i].c;
    sort(v+1,v+m+1,cmp);
    for (i=1;i<=n;i++)
    {
        dim[i]=1;
        tata[i]=i;
    }
    for (i=1;i<=m && k<n;i++)
    {
        if (tata_multime(v[i].x)!=tata_multime(v[i].y))
        {
            unire(v[i].x,v[i].y);
            rez+=v[i].c;
            sol[++k]=v[i];
        }
    }
    g<<rez<<'\n'<<k<<'\n';
    for (i=1;i<=k;i++) g<<sol[i].x<<' '<<sol[i].y<<'\n';
    return 0;
}