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

#define ll long long
#define rep(i, n) for (int i = 0; i < (n); i++)
#define P pair<int, int>

int main() {
  string s;
  cin >> s;

  rep(i, s.size()) {
    if (i == 0) {
      cout << s[0];
      continue;
    }
    if (s[i-1] == s[i]) continue;
    cout << s[i];
  }
  cout << endl;


}