#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int INF = 1e+9;

int main(){
    string s,t;
    cin >> s;
    for(int i=0; i<s.size(); i++){
        if(s[i] != s[i+1]) t += s[i];
    }

    cout << t << endl;
}