#include <bits/stdc++.h>
using namespace std;
ifstream fin("apm.in");
ofstream fout("apm.out");

typedef long long ll;
typedef long double ld;
typedef double db;
typedef string str;

typedef pair<int, int> pi;
typedef pair<ll,ll> pl;
typedef pair<ld,ld> pd;

typedef vector<int> vi;
typedef vector<ll> vl;
typedef vector<ld> vd;
typedef vector<str> vs;
typedef vector<pi> vpi;
typedef vector<pl> vpl;

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)

#define sz(x) (int)x.size()
#define all(x) begin(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define rsz resize
#define ins insert

#define mp make_pair
#define pb push_back
#define eb emplace_back
#define f first
#define s second
#define lb lower_bound
#define ub upper_bound

const int MOD = 1e9+7; ///Lifehack: +2*MOD
const int NMAX = 2e5+5;
const ll INF = 1e18;
const ld PI = 4*atan((ld)1);

namespace input {
	template<class T> void re(complex<T>& x);
	template<class T1, class T2> void re(pair<T1,T2>& p);
	template<class T> void re(vector<T>& a);
	template<class T, size_t SZ> void re(array<T,SZ>& a);

	template<class T> void re(T& x) { cin >> x; }
	template<class T, class... Ts> void re(T& t, Ts&... ts) {
		re(t); re(ts...);
	}

	template<class T> void re(complex<T>& x) { T a,b; re(a,b); x = cd(a,b); }
	template<class T1, class T2> void re(pair<T1,T2>& p) { re(p.f,p.s); }
	template<class T> void re(vector<T>& a) { F0R(i,sz(a)) re(a[i]); }
	template<class T, size_t SZ> void re(array<T,SZ>& a) { F0R(i,SZ) re(a[i]); }
}

using namespace input;

namespace output {
	void pr(int x) { cout << x; }
	void pr(long x) { cout << x; }
	void pr(ll x) { cout << x; }
	void pr(unsigned x) { cout << x; }
	void pr(unsigned long x) { cout << x; }
	void pr(unsigned long long x) { cout << x; }
	void pr(float x) { cout << x; }
	void pr(double x) { cout << x; }
	void pr(ld x) { cout << x; }
	void pr(char x) { cout << x; }
	void pr(const char* x) { cout << x; }
	void pr(const string& x) { cout << x; }
	void pr(bool x) { pr(x ? "true" : "false"); }
	template<class T> void pr(const complex<T>& x) { cout << x; }

	template<class T1, class T2> void pr(const pair<T1,T2>& x);
	template<class T> void pr(const T& x);

	template<class T, class... Ts> void pr(const T& t, const Ts&... ts) {
		pr(t); pr(ts...);
	}
	template<class T1, class T2> void pr(const pair<T1,T2>& x) {
		pr("{",x.f,", ",x.s,"}");
	}
	template<class T> void pr(const T& x) {
		pr("{"); // const iterator needed for vector<bool>
		bool fst = 1; for (const auto& a: x) pr(!fst?", ":"",a), fst = 0;
		pr("}");
	}

	void ps() { pr("\n"); } // print w/ spaces
	template<class T, class... Ts> void ps(const T& t, const Ts&... ts) {
		pr(t); if (sizeof...(ts)) pr(" "); ps(ts...);
	}

	void pc() { pr("]\n"); } // debug w/ commas
	template<class T, class... Ts> void pc(const T& t, const Ts&... ts) {
		pr(t); if (sizeof...(ts)) pr(", "); pc(ts...);
	}
	#define dbg(x...) pr("[",#x,"] = ["), pc(x);
}
using namespace output;

struct muchie
{int x,y,cost;
 friend bool operator > (muchie,muchie);
 friend bool operator > (muchie a,muchie b)
{return a.cost>b.cost;
}
};

int n,m,ans;
muchie s[NMAX];
int tata[NMAX];
int h[NMAX];
priority_queue<muchie,vector<muchie>,greater<muchie>>coada;
int Find(int x)
{int rad=x,y;
 while(tata[rad])
      rad=tata[rad];
 while(tata[x])
      {y=tata[x];
       tata[x]=rad;
       x=y;
      }
 return rad;
}
void Union(int x,int y)
{int rx,ry;
 rx=Find(x);
 ry=Find(y);
 if(h[rx]>h[ry])
    tata[ry]=rx;
    else
      {tata[rx]=ry;
       if(h[rx]==h[ry])
         h[ry]++;
      }
}
void solve() {
fin>>n>>m;
FOR(i,1,m+1)
{muchie a;
 fin>>a.x>>a.y>>a.cost;
 coada.push(a);
}
int nrsel=0;
while(nrsel<n-1)
     {muchie a;
      a=coada.top();
      coada.pop();
      int c1=Find(a.x);
      int c2=Find(a.y);
      if(c1!=c2)
        Union(c1,c2),s[++nrsel]=a,ans+=a.cost;
     }
 fout<<ans<<'\n';
 fout<<n-1<<'\n';
 FOR(i,1,nrsel+1)
    fout<<s[i].x<<' '<<s[i].y<<'\n';
}

int main() {
	//ios_base::sync_with_stdio(false); cin.tie(0);
	int t=1;
    //cin>>t;
  	while(t--)
         solve();
    return 0;

}