#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;
signed main() { 
  ios::sync_with_stdio(false); cin.tie(0);
  string s;
  cin >> s;
  int n = s.size();
  for (int i = 0; i < n; i++) {
    cout << s[i];
    if (i < n - 1 && s[i] == s[i + 1]) i++;
  }
  cout << endl;
  return 0;
}