#include<fstream.h>
#include<conio.h>
#include<stdlib.h>
#define NM 200
#define MM 400
#define endl "\n"
ifstream in("apm.in");
ofstream out("apm.out");

struct muchie{int x,y,c;};

int n,m,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=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;
}