#pragma GCC optimize ("O2")
#pragma GCC target ("avx2")
#include<bits/stdc++.h>
//#include<atcoder/all>
//using namespace atcoder;

using namespace std;
typedef long long ll;
#define rep(i, n) for(int i = 0; i < (n); i++)
#define rep1(i, n) for(int i = 1; i <= (n); i++)
#define co(x) cout << (x) << "\n"
#define cosp(x) cout << (x) << " "
#define ce(x) cerr << (x) << "\n"
#define cesp(x) cerr << (x) << " "
#define pb push_back
#define mp make_pair
#define chmin(x, y) x = min(x, y)
#define chmax(x, y) x = max(x, y)
#define Would
#define you
#define please



int main() {
	cin.tie(0);
	ios::sync_with_stdio(false);


	string S;
	cin >> S;
	int N = S.size();

	rep(i, N) {
		if (i != N - 1 && S[i] == S[i + 1]) {
			cout << S[i];
			i++;
		}
		else cout << S[i];
	}


	Would you please return 0;
}