#include <iostream>
#include <cstdio>

using namespace std;

int cnt[2], s[30], a, b;

int main() {
    freopen("input.txt", "r", stdin);
    cin >> a >> b;

    int top_mask = 1;
    for (int i = 0; i < a + b; i++)
        top_mask *= 2;

    for (int i = 0; i < top_mask; i++) {

        cnt[0] = cnt[1] = 0;
        for (int j = 0, k = 1; j < a + b; j++, k *= 2) {
            s[j] = ((k & i) != 0);
            cnt[ s[j] ]++;
        }

        if (cnt[0] == b && cnt[1] == a) {
            bool ok = true;

            int l = a + b;

            for (int j = 1; j < l; j++) {
                if (s[j] + s[j - 1] == 0) {
                    ok = false;
                    break;
                }
            }

            for (int j = 1; j < l - 1; j++) {
                if (s[j] == 1 && s[j - 1] + s[j + 1] == 0) {
                    ok = false;
                    break;
                }
            }

            if ((s[0] == 1 && s[1] == 0) || (s[l - 1] == 1 && s[l - 2] == 0))
                ok = false;

            if (ok) {
                for (int j = 0; j < l; j++)
                    cout << s[j];
                cout << endl;
            }
        }
    }

    return 0;
}