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#include <stdio.h>
void print(const char *s, int n)
{
        while (n-- > 0)
                printf("%s", s);
}
int main()
{
        int m, n;
        while (EOF != scanf("%d%d", &n, &m)) {
                if (m == 0)
                        print("0", n);
                else if (n == 0)
                        print("1", m);
                else if (m == n)
                        print("01", m);
                else if (n == m+1) {
                        print("01", m);
                        print("0", 1);
                } else if (m == n+1) {
                        print("10", n);
                        print("1", 1);
                } else if (n > m+1) {
                        print("01", m);
                        print("0", n-m);
                } else
                        print("NO", 1);
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