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#include <iostream>
#include <fstream>
#include <cstring>
char text[1000014],urm_litera;
int n,i,j,a[200];
using namespace std;
int main(void)
{
fstream f,g;
f.open("ordine.in",ios::in);
g.open("ordine.out",ios::out);
f>>text;
n=strlen(text);
for (i=0;i<n;i++)
a[text[i]]++;
char antecedenta=NULL;
for (i=0;i<n;i++)
{
urm_litera='z';
for (j='a';j<='z';j++)
if (a[j] == (n-i)/2+1 && j != antecedenta)
{
urm_litera=j;
break;
}
else
if (a[j] && j != antecedenta && j < urm_litera)
urm_litera=j;
g<<urm_litera;
a[urm_litera]--;
antecedenta= urm_litera;
}
g<<endl;
}