#include <string>
#include <vector>
#include <list>
#include <cmath>
#include <algorithm>
#include <map>
#include <set>
#include <iostream>
#include <cstdio>
#include <cstdlib>
using namespace std;

class A0Paper {
  public:
    string canBuild(vector <int> A);
};

string A0Paper::canBuild(vector <int> A)
{
  return "";
}