#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>
using namespace std;
typedef long long int ll;
typedef unsigned long long ull;

mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());
ll myRand(ll B) {
    return (ull)rng() % B;
}

int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);
    string s; cin >> s;
    for(int i=0;i<s.size();i++){
        if(i>0 and s[i-1]==s[i])continue;
        cout << s[i];
    }
    cout << endl;
}