#line 1 "main.cpp"
#include <iostream>
#include <algorithm>
#include <numeric>
#include <vector>
#include <string>

using namespace std;

void solve() {
    string s;
    cin >> s;

    char prev = '$';
    for (auto c : s) {
        if (c != prev) cout << c;
        prev = c;
    }
    cout << "\n";
}

int main() {
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    solve();

    return 0;
}