Codeforces_339A

//Codeforces Round 339A
#include <string>
#include <cstring>
#include <iostream>
using namespace std;
int main()
{
    int len, ch=0;
    char mass[101], sub;
    string s;
    cin >> s;
    len = s.size();
    strcpy(mass, s.c_str());
    for(int i=0;i<len;i++)
    {
        ch=0;
        for(int i=0;i<len;i++)
        {
            if(mass[i]=='2' && mass[i+2]=='1')
            {
                sub = mass[i];
                mass[i] = mass[i+2];
                mass[i+2] = sub;
                ch=1;
            }
            else if(mass[i]=='3' && (mass[i+2]=='1' || mass[i+2]=='2'))
            {
                sub = mass[i];
                mass[i] = mass[i+2];
                mass[i+2] = sub;
                ch=1;
            }
        }
        if(ch==0){break;}
        i++;
    }
    cout << mass;
    return 0;
}