#define _GLIBCXX_DEBUG
#define ll long long
#include <bits/stdc++.h>
using namespace std;
using Graph = vector<vector<int>>;

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