#include <iostream>
#include <string>

int main() {
    std::string s, t;
    std::cin >> s;
    auto last = '_';

    for (auto c : s)
    {
        if (last != c)
        {
            t.push_back(c);
        }
        
        last = c;
    }

    std::cout << t << std::endl;    
}