#include <stdio.h>

int main()
{
  int p, q, pp, qq, achou = 0, D = 1;

  scanf("%d %d", &p, &q);

  pp = p; qq = q;

  while (p>0) {
    D *= 10;
    p /= 10;
  }
  p = pp;

  while ((q >= p) && (!achou))
    if (q % D == p)
      achou = 1;
    else
      q /= 10;

  if (achou)
    printf("%d 'e subnumero de %d.\n", pp, qq);
  else
    printf("%d nao 'e subnumero de %d.\n", pp, qq);
  
  return 0;
}