#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define fi first
#define se second
#define all(a) a.begin(),a.end()
int main(){
  string s;
  cin >> s;
  int n=s.size();

  string ans;
  ans.push_back(s[0]);
  for(int i=1; i<n; ++i){
    if(s[i-1]==s[i]) continue;
    ans.push_back(s[i]);
  }
  cout << ans << endl;
  return 0;
}