#include <iostream>
#include <string>

using namespace std;

int main(){
    string s, ss;
    cin >> s;
    for (long long i = 0; i < s.size(); i++){
        if (s[i] == s[i+1] && i < s.size()-1) continue;
        else ss.push_back(s[i]);
    }
    cout << ss << endl;
}