num12

#include <iostream>
#include <string>
using namespace std;



int main() {
    string s(99, '1');
    cin >> s;
    while (s.find("111") != string::npos) {
        s.replace(s.find("111"), 3, "22");
        if (s.find("222") != string::npos) {
            s.replace(s.find("222"), 3, "11");
        }
    }
    cout << s;
    return 0;
}