#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
typedef long long ll;
using namespace std;

int main() {
    string S;
    cin >> S;

    S.erase(unique(S.begin(), S.end()), S.end());
    cout << S << endl;

    return 0;
}