int main()
{int n,i,j,s=0;
int a[20000];
scanf("%d",&n);
for(i=1;i<=n;i=i+1)
{scanf("%d",&a[i-1]);}
for(i=1;i<=n;i=i+1)
{s=0;
if(i==1) printf("%d",a[i-1]);
else
{for(j=0;j<i-1;j=j+1)
{s=(a[i-1]==a[j]) ? s+1 : s;}
if(s==0) printf(" %d",a[i-1]);}}
return 0;
}