#include <iostream>
using namespace std;
const int n = 20;
bool increment(bool* a) {
    for (int i = 0; i < n; i++) {
        a[i] = not a[i];
        if (a[i]) return false;
    }
    return true;
}
void disp(bool* a) {
    for (int i = 0; i < n; i++) cout << a[i];
    cout << endl;
}
int main() {
    bool list[n];
    for (int i = 0; i < n; i++) list[i] = 0;
    disp(list);
    while (not increment(list)) disp(list);
}