#include <bits/stdc++.h>
using namespace std;

int main()
{
	string S;
	cin >> S;

	int N = S.size();
	for( int i = 0; i < N; i++ ) {
		if( i + 1 < N && S[i] == S[i + 1] ) continue;
		cout << S[i];
	}
	cout << endl;
}