#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using Graph = vector<vector<int>>;
int main() {
  string S; cin >> S;
  string ans = "";
  for(int i = 0; i < S.size(); i++) {
    ans += S[i];
    if(S[i] == S[i + 1]) {
      i++;
    }
  }
  cout << ans<< endl;
}