/**
 *   @FileName	a.cpp
 *   @Author	kanpurin
 *   @Created	2021.04.11 15:15:32
**/

#include "bits/stdc++.h" 
using namespace std; 
typedef long long ll;

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