#include <bits/stdc++.h>
#include <atcoder/all>
using namespace std;
using namespace atcoder;
using ll = long long;
using ld = long double;

int main() {
  string S; cin >> S;
  cout << S[0];
  for (int i = 1; i < S.size(); i++) {
    if (S[i] != S[i - 1]) cout << S[i];
  }
  cout << endl;
  return 0;
}