#include <bits/stdc++.h>
#include <string.h>
#define rep(i,n) for(int i = 0; i < n; i++)
#define srep(i,a,b) for(int i = a; i < b; i++)
#define all(A) (A).begin(),A.end()
#define MOD 1000000007
using namespace std;
using ll = long long;
using P = pair<int,int>;
using Graph = vector<vector<int>>;

int main(void){
	string s; cin >> s;
	string t = "";
	rep(i,(int)s.size()-1){
		if(s[i] == s[i+1]){
			t += s[i+1];
			i++;
		} else t += s[i];
	}
	cout << t;
	if(t[(int)t.size()-1] != s[(int)s.size()-1]) cout << s[(int)s.size()-1];
	cout << endl;
}