#include<bits/stdc++.h>
#define MOD 1000000007
#define INF 0x3f3f3f3f
#define INFL 0x3f3f3f3f3f3f3f3f
#define EPS (1e-10)
#define rep(i,n)for(int i=0;i<(n);i++)
using namespace std;
typedef long long ll;
typedef pair<int, int>P;

int a[20171];
int main() {
	int n, k; cin >> n >> k;
	rep(i, n)a[i] = i & 1;
	int p = 0;
	while (k) {
		if (k >= 2 && p + 1 < n) {
			a[p + 1] = !a[p + 1]; k -= 2;
			p += 2;
		}
		else {
			if (p >= n) {
				puts("-1"); return 0;
			}
			a[p] = !a[p]; k--; p += 2;
		}
	}
	rep(i, n)cout << a[i] << endl;
}