#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
#define int ll
#define _FastIO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define pb emplace_back
#define pii pair<int , int>
#define F first
#define S second
const int mod = 1000000007;
const int MAXX = 1e6 + 5;

string s;

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