#include <cstring>
#include <algorithm>
#include <iostream>
#include <fstream>

char phrase[201];

int main()
{
    scanf("%s",phrase);
    int n = 0;
    for(int i=0; i<=strlen(phrase); i++)
    {
        for(n; n<=strlen(phrase); n++)
        {
            if (phrase[n] <= phrase[n+1])
            {
                char temp,temp2;
                temp = phrase[n];
                temp2=phrase[n+1];

                phrase[n]= temp2;
                phrase[n+1]=temp;
                goto main;
                break;
            }
        }
    }
    main:
    std::cout << phrase;
}