#import<bits/stdc++.h>
std::ifstream r("apm.in");std::ofstream w("apm.out");int m,k,i,j,z,t[1<<20],x;struct s{int x,y,z;}d,e[1<<20];int f(int x){return t[x]?t[x]=f(t[x]):x;}main(){r>>m>>m;while(r>>e[i].x>>e[i].y>>e[i].z)i++;std::sort(e,e+m,[](s a,s b){return a.z<b.z;});while(j<m)d=e[j],e[f(d.y)^(x=f(d.x))?t[x]=d.y,z+=d.z,k++:j++]=d;e[k]={z,k++};while(k--)w<<e[k].x<<" "<<e[k].y<<" ";}