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#include<iostream>
#include<cstring>
#include<fstream>
using namespace std;
int i,j,f[30],k;
char c1,c2,c;
string s,sol;
int main()
{
ifstream cin("ordine.in");
ofstream cout("ordine.out");
cin>>s;
for(i=0; i<s.size(); i++)
f[s[i]-'a']++;
c=-1;
for(i=0; i<s.size(); i++)
{
for(j=0; j<='z'-'a'; j++)
{
if(f[j]>0)
if(i<0)
{
int ok=0;
for(k=j+1; k<='z'-'a'; k++)
if(f[k]>(s.size()-i)/2)
ok=1;
if(ok==1)
continue;
f[j]--;
sol+=(char)(j+'a');
break;
}
else if(sol[i-1]!=j+'a')
{
int ok=0;
for(k=j+1; k<='z'-'a'; k++)
if(f[k]>(s.size()-i)/2)
ok=1;
if(ok==1)
continue;
f[j]--;
sol+=(char)(j+'a');
break;
}
}
}
cout<<sol;
return 0;
}