#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
typedef long long ll;

int main() {
    string s; cin >> s;
    char now = 'A';
    for (int i = 0; i < s.size(); i++) {
        if (s[i] != now) cout << s[i];
        now = s[i];
    }
    puts("");
    return 0;
}