#include <bits/stdc++.h>

using namespace std;

int main()
{
    string s;
    cin >> s;
    int i = 1;
    while(i < s.size()){
        if(s[i-1] == s[i]){
            s.erase(i-1, 2);
            if( i != 1) i--;
        }
        else i++;
    }
    if(s == "") s = "Empty String";
    cout << s;
    return 0;
}

string superReducedString(string s) {
    string result;
    LOOP:
    string ns; ns.clear(); ns.shrink_to_fit();
    bool flag = false; int i = 0; 
    while(i < s.length()){
        if (s[i] == s[i+1]){i= i + 2; flag = true;}
        else {ns.push_back(s[i]);i = i + 1; }
    }
    if (flag == true)
   {s.clear(); s.shrink_to_fit(); s = ns; goto LOOP;}
    if (ns.length() > 0){result = ns;}
    else {result = "Empty String";}
    return result;
}

def super_reduced_string(s: str) -> str:    
    for c in s:
        s = s.replace(c + c, "", 1)            
    
    return s if s else "Empty String"

public static String superReducedString(String s) {
    // Write your code here
    StringBuffer sb = new StringBuffer(s);
    char p = '!';
    int i = 0;
    while(i< sb.length()){
        char c = sb.charAt(i);
        if(c==p){
            sb.deleteCharAt(i);
            i--;
            sb.deleteCharAt(i);
            i--;
            p = '!';
            if(i<0){
                i=0;
            }
        }else{
            p = c;
            i++;
        }
    }
    String res =sb.toString();
    if(res.length()==0){
        return "Empty String";
    }
    return res;
    }

def superReducedString(s):
    new_s = ''
    for i in range(len(s)):
        if not new_s:
            new_s += s[i]
            continue
        
        if new_s[-1]==s[i]:
            new_s = new_s[:-1]
        else:
            new_s += s[i]
            
    return new_s if new_s else 'Empty String'