include include

using namespace std;

int main() {
string str;
cout << "Enter a string of 0s and 1s: ";
cin >> str;

int count = 0;
for (int i = 0; i < str.length(); i++) {
if (str[i] == '0' || str[i] == '1') {
count++;
} else {
if (count % 2 == 0) {
cout << str.substr(i - count, count) << endl;
}
count = 0;
}
}
if (count % 2 == 0) {
cout << str.substr(str.length() - count, count) << endl;
}
return 0;

}