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#include <fstream>
#include <tuple>
#include <vector>
#include <algorithm>
using namespace std;
ifstream f("apm.in");
ofstream g("apm.out");
vector <tuple<int,int,int>> muchii;
vector <int> v[101];
int n,m,cost,nr,x,y,c,h[101],p[101];
int Find(int x)
{
while(x!=p[x])
x=p[x];
return x;
}
void Union(int x,int y)
{
x=Find(x);
y=Find(y);
if(x!=y)
if(h[x]<h[y])
p[x]=y;
else
if(h[y]<h[x])
p[y]=x;
else
{
p[x]=y;
h[y]++;
}
}
int main()
{
f>>n>>m;
for(int i=1;i<=n;i++)
{
p[i]=i;
h[i]=1;
}
for(int i=1;i<=m;i++)
{
f>>x>>y>>c;
muchii.push_back(make_tuple(c,x,y));
}
sort(muchii.begin(),muchii.end());
cost=0;
nr=0;
for(int i=0;i<m;i++)
{
x=get<1>(muchii[i]);
y=get<2>(muchii[i]);
c=get<0>(muchii[i]);
if(Find(x)!=Find(y))
{
nr++;
cost+=c;
v[nr].push_back(x);
v[nr].push_back(y);
Union(x,y);
}
}
g<<cost<<'\n'<<nr<<'\n';
for(int i=1;i<=nr;i++)
g<<v[i][0]<<' '<<v[i][1]<<'\n';
return 0;
}