#include "bits/stdc++.h"

using namespace std;
using ll = long long;

void Main() {
    string S;
    cin >> S;
    int N = S.size();
    string ans = "";
    ans += S[0];
    for (int i = 1; i < N; ++i) {
        if (S[i] != S[i - 1]) {
            ans += S[i];
        }
    }
    cout << ans << endl;
}

int main() {
    std::cout << std::fixed << std::setprecision(15);
    Main();
    return 0;
}