#include<stdlib.h>
#include<fstream.h>
#define NM 200001
#define MM 400001
#define endl "\n"
 
ifstream in("apm.in");
ofstream out("apm.out");
 
struct muchie{int x,y,c;};
int m,n,L[NM];
muchie v[MM],h[NM];
void citire(){
int i;
in>>n>>m;
for(i=0;i<m;i++)
    in>>v[i].x>>v[i].y>>v[i].c;
}
int fcmp(void const *a,void const *b)
{
return ((muchie*)a)->c-((muchie*)b)->c;
}
 
int min(int x,int y){
if(x<y) return x;
return y;
}
 
int max(int x,int y){
if(x>y) return x;
return y;
}
 
int main(){
int i,ms=0,j,ct=0;
citire();
qsort(v,m,sizeof(v[0]),fcmp);
for(i=1;i<=n;i++)L[i]=i;
i=0;
while(ms<n-1){
    while(L[v[i].x]==L[v[i].y])i++;
    h[ms]=v[i];
    ms++;
    ct+=v[i].c;
    int a=min(L[v[i].x],L[v[i].y]);
    int b=max(L[v[i].x],L[v[i].y]);
    for(j=1;j<=n;j++)
        if(L[j]==b) L[j]=a;
 
            }
    out<<ct<<endl<<n-1<<endl;
for(i=0;i<n-1;i++)
    out<<h[i].x<<" "<<h[i].y<<endl;
    return 0; 
  }