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#include <cstdio>
#include <vector>
#include <queue>
#include <algorithm>
using namespace std;
struct edge
{
int nod,c;
};
vector<edge> v[200010];
struct heap
{
int nod,c,tata;
bool operator <(const heap &aux) const
{
return c>aux.c;
}
};
priority_queue<heap> h;
pair<int,int> sol[200010];
char vaz[200010];
void update(int nod)
{
for(vector<edge>::iterator it=v[nod].begin();it!=v[nod].end();it++)
if(!vaz[it->nod]) h.push({it->nod,it->c,nod});
}
int main()
{
freopen("apm.in", "r", stdin);
freopen("apm.out", "w", stdout);
int n,m,x,y,c,nr=0,sum=0;
scanf("%d%d",&n,&m);
for(int i=1;i<=m;i++)
{
scanf("%d%d%d",&x,&y,&c);
v[x].push_back({y,c});
v[y].push_back({x,c});
}
update(1);
vaz[1]=1;
while(!h.empty())
{
int nod=h.top().nod,c=h.top().c,tata=h.top().tata;
h.pop();
if(vaz[nod]) continue;
vaz[nod]=1;
sum+=c;
sol[++nr]={nod,tata};
update(nod);
}
printf("%d\n%d\n",sum,nr);
for(int i=1;i<=nr;i++) printf("%d %d\n",sol[i].first,sol[i].second);
return 0;
}