#include <bits/stdc++.h>
#include<iostream>
#include<map>
#include<vector>
#include <algorithm>
#include<math.h>
#include <iomanip>
#include<set>
#include <numeric>
#include<string>
using ll = long long;
using namespace std;

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