#include <bits/stdc++.h>
using namespace std;

int main() {
  string S;
  cin >> S;
  deque<char> d;
  d.push_back(S.at(0));
  
  for (int i = 1; i < (int)S.size(); i++) {
    if (d.back() != S.at(i))
      d.push_back(S.at(i));
  }
  
  for (char C : d)
    cout << C;
  cout << endl;
}