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#include <bits/stdc++.h>
using namespace std;
ifstream f("apm.in");
ofstream g("apm.out");
struct muchie
{
int x, y, w;
inline bool operator<(muchie m)
{return (w<m.w);}
};
vector<muchie> v;
vector<int> t, r;
int n, m;
void rd()
{
f>>n>>m;
v.resize(m);
t.resize(n+1);
for(int i=0; i<m; i++)
f>>v[i].x>>v[i].y>>v[i].w;
for(int i=1; i<=n; i++)
t[i]=i;
}
int tata(int x)
{
if(t[x]!=x)
t[x]=tata(t[x]);
return t[x];
}
inline void unite(int x, int y)
{
t[tata(x)]=tata(y);
}
inline bool q(int x, int y)
{
return (tata(x)==tata(y));
}
inline int Kruskal()
{
int cost=0, i=0;
sort(v.begin(), v.end());
while(r.size()!=n-1)
{
while(q(v[i].x, v[i].y))
i++;
r.push_back(i);
cost+=v[i].w;
unite(v[i].x, v[i].y);
i++;
}
return cost;
}
int main()
{
rd();
g<<Kruskal()<<'\n'<<n-1<<'\n';
for(auto a:r)
g<<v[a].x<<' '<<v[a].y<<'\n';
f.close();
g.close();
return 0;
}