import java.util.Scanner;
import java.lang.String;
class Main{
  public static void main(String[] args){
    Scanner scan=new Scanner(System.in);
    String S;
    try{
      S=scan.next();
    }catch(Exception e){
      System.out.println();
      return;
    }
    int len=S.length();
    if(len<2){
      System.out.println(S);
      return;
    }
    StringBuilder ans=new StringBuilder();
    ans.append(S.charAt(0));
    char a=S.charAt(0);
    for(int i=1;i<len;i++){
      if(S.charAt(i)!=a){
        ans.append(S.charAt(i));
      }
      a=S.charAt(i);
    }
    System.out.println(ans.toString());
    return;
  }
}