this my solution:

#include <iostream>
#include <string>
#include <stdlib.h>
#include <algorithm>

using namespace std;

int main(){

int bilo;
string s;
cin>>s;


for (int j = 0; j < s.length() - 1; j++){
    bilo = 0;
    for (int i = 0; i < s.length()-1; i++){
      if (s[i] != '1')
        if ((s[i] == s[i+1])){
          s[i] = '1';
          s[i+1] = '1';
          bilo = 1;

          if (i < s.length()-1){
          rotate(&s[i], &s[i+1], &s[i] + s.length() - i);
          rotate(&s[i], &s[i+1], &s[i] + s.length() - i);
          }

        }
     }
  if (bilo = 0)
      break;
}

int i = 0;
while (s[i]!='1'){
    cout<<s[i];
    i++;
}


   //system("pause");
    return 0;
}

please send me answer on my e-mail: sergeo_91_@mail.ru  or write me here.
P.S. thank you in advance.