#include <iostream>
using namespace std;

int main() {
	string s;
	cin>>s;
	string ans;
	ans = s[0];
	for(int i = 1; i<s.size();i++){
		if(s[i-1] != s[i]){
			ans+=s[i];
		}
	}
	//if(s[s.size()-2]!=s[s.size()-1])ans+=s[s.size()-1];
	cout<< ans;
}