#include <bits/stdc++.h>
//#include <boost/multiprecision/cpp_int.hpp>
#define ll long long
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
//namespace mp = boost::multiprecision;
//mp::cpp_int
/* nyuuryoku retu de ukeoru   string s; getline(cin,s);  */
using namespace std;
signed main(){
    string S;
    cin >> S;
    for(int i = 0; i < S.size() ; i++){
        if(S.at(i) == S.at(i+1) && i+1 <= S.size()){
            S.erase(S.begin()+i);

        }
    }
    cout << S <<endl;
}