#include <stdio.h>
#include <atcoder/all>
#include <bits/stdc++.h>
using namespace std;
using namespace atcoder;
using mint = modint998244353;
#define rep(i,n) for (int i = 0; i < (n); ++i)
#define Inf 1000000000000000

int main(){
	
	string s;
	cin>>s;
	
	string t = "";
	
	rep(i,s.size()){
		if(t.size()>0 && t.back()==s[i])continue;
		t += s[i];
	}
	
	cout<<t<<endl;
	
    return 0;
}