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// Name: ordine.cpp
//Dobricean Ionut
#include <cstring>
#include <fstream>
using namespace std;
ifstream fin("ordine.in");
ofstream fout("ordine.out");
char t[10000001];
int frec[32],n,all=1,mi=1000;
char last;
int main()
{ fin.get(t,1000001);
n=strlen(t);
for(int i=0; i<n; i++)
frec[t[i]-'a']++,mi=min((t[i]-'a'),mi);
fout<<(char)(mi+'a');
last=mi+'a';
frec[mi]--;
while(all<n)
{ for(int i=mi; i<32; i++)
if(last!=i+'a' && frec[i]>0)
{ fout<<(char)(i+'a');
frec[i]--;
last=i+'a';
all++;
break;
}
}
}