#include<stdio.h>
main()
{int i,n,count;
 char s[15][27];
 count=1;
 while(scanf("%d",&n)!=EOF)
 {if(n==0)break;
  for(i=0;i<n;i++)
   scanf("%s",s[i]);
  printf("SET %d\n",count++);
  for(i=0;i<n;i+=2)
   printf("%s\n",s[i]);
  for(i=n-1-n%2;i>0;i-=2)
   printf("%s\n",s[i]);
 }
}