int f(int *p,int *t,int);
void main()
{int a[300],b[300],n,i,s;
scanf("%d",&n);
for(i=0;i<=n-1;i++)
scanf("%d",&a[i]);
s=f(a,b,n);
for(i=0;i<=s-1;i++)
printf("%d,",*(b+i));
printf("%d\n",*(b+s));

}


int f(int *p,int *t,int n)
{int i,j,s=0;
*t=*p;
for(i=1;i<=n-1;i++)
{ for(j=0;j<=s;j++)
{if(*(p+i)==*(t+j))
   break;

}
  if(j==s+1)
  {	*(t+j)=*(p+i);
   s++;
  
  }
}	
return s;


}