#include <string>
#include <vector>
#include <algorithm>

using namespace std;

bool cmp(int a, int b)
{
    string tempA = to_string(a) + to_string(b);
    string tempB = to_string(b) + to_string(a);
    return stoi(tempA) > stoi(tempB);
}


string solution(vector<int> numbers) {
    string answer = "";
    sort(numbers.begin(), numbers.end(), cmp);
    for(auto n : numbers) 
    {
        answer += to_string(n);
    }
    if(answer.at(0)=='0') answer = '0';
    
    return answer;
}