339A Beautiful Math
//bismillah
#include<iostream>
#include <stdio.h>
#include <string.h>
using namespace std;
#include <algorithm>
int main()
{
char s[100];
cin>>s;
int i=0, ln=strlen(s);
sort(s,s+ln);
int count = 0;
for(i=0;i<=ln-1;i++){
if(s[i]!='+')
{cout<<s[i];
if(i==ln-1)break; cout<<"+";}
}
return 0;
}
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