#include <bits/stdc++.h>
using namespace std;
int v[11], cp, u;
char s;
bool ok;
int main()
{
    std::ifstream fin("tan.in");
    std::ofstream fout("tan.out");
    while (fin >> s)
        v[s-'0']++;
    for (int i = 0; i <= 8; i += 2)
        cp += v[i];
    if ((cp == 2 && v[0] == 1) || cp == v[0])
        u = 0, v[0]--;
    else
    {
        for (int i = 8; i >= 0 && u == 0; i -= 2)
        {
            if (v[i])
            {
                u = i;
                v[i]--;
                break;
            }
        }
    }
    for (int i = 1; i < 10 && ok == false; i++)
        if (v[i])
        {
            fout << i;
            v[i]--;
            ok = true;
            break;
        }
    for (int i = 0; i < 10; i++)
        while (v[i])
            fout << i, v[i]--;
    fout << u;

}