pb63 29/1/2020

#include <iostream>
#include <fstream>
using namespace std;

#define NMAX 15000
#define INFILE "BAC.IN"

int cifra(int x)
{
    if (!x)
        return 0;
    while (x)
    {
        if ((x % 10) % 2 == 0)
            return x % 10;
        x /= 10;
    }
    return -1;
}

int n, m, v[NMAX];
int main()
{
    ifstream fin(INFILE);
    fin >> n;
    for (int i = 0; i < n; i++)
    {
        int x;
        fin >> x;
        int u = cifra(x);
        if (u != -1)
            v[m++] = u;
    }

    int sor = 0;
    while (!sor)
    {
        sor = 1;
        for (int i = 0; i < m - 1; i++)
            if (v[i] < v[i + 1])
            {
                swap(v[i], v[i + 1]);
                sor = 0;
            }
    }

    for (int i = 0; i < m; i++)
        cout << v[i];

    return 0;
}