import java.util.*;
class Main{
	public static void main(String args[]){
    	Scanner sc = new Scanner(System.in);
      	String S = sc.next();
      	String spt[] =S.split("");
      	String ans="";
      	for(int i=0;i<spt.length;i++){
      	    if(spt[i].equals("0")){
      	        ans+="0";
      	    }else if(spt[i].equals("1")){
      	        ans+="1";
      	    }else if(spt[i].equals("B")){
      	        if(!(ans.isEmpty())){
      	            ans =ans.substring(0, ans.length()-1);
      	        }
      	        
      	    }
      	}
      	
      System.out.println(ans);
    }
}

/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz