HelfFulmat

#include <iostream>
#include <string>
#include <cstring>
#include <cstdio>
#include <vector>
#include <algorithm>
using namespace std;

int main(int argc, char **argv)
{

    vector <char> number;

    int length, i;

    char equation[100];

    gets(equation);



    length= strlen(equation);

//  printf("%d",length);

    for(i=0;i<length; i+=2){

        number.push_back(equation[i]);



        }

        sort(number.begin(),number.end());

        for(i =0; i<number.size()-1; i++){


            printf("%c+", number[i]);


            }

            printf("%c", number[i]);


        //printf("%d", number.size());


    return 0;
}