#include <iostream>
#include <vector>
#include <algorithm>
#include <atcoder/dsu>
using namespace std;
using i32 = int32_t;
using i64 = int64_t;
#define rep(i,n) for(int i=0; i<(n); i++)

int N;
vector<pair<string,pair<int,int>>> E;

int main(){
  cin >> N;
  rep(i,N*(N-1)/2){
    int a,b; cin >> a >> b; a--; b--;
    string C; cin >> C;
    reverse(C.begin(),C.end());
    C.resize(100,'0');
    reverse(C.begin(),C.end());
    E.push_back({C,{a,b}});
  }
  sort(E.begin(),E.end());

  atcoder::dsu G(N);
  for(auto& e : E){
    G.merge(e.second.first,e.second.second);
    if(G.size(0) < N) continue;
    auto c = e.first;
    reverse(c.begin(),c.end());
    while(c.back() == '0') c.pop_back();
    reverse(c.begin(),c.end());
    cout << c << endl;
    break;
  }
  return 0;
}




struct ios_do_not_sync{
  ios_do_not_sync(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
  }
} ios_do_not_sync_instance;