#include <stdio.h>

main()

{
  register int tmp1,tmp2,tmp3,tmp4;
  

  while((tmp1 = getchar()) != EOF) {
    tmp2 = getchar();
    tmp3 = getchar();
    tmp4 = getchar();
    putchar(tmp4);
    putchar(tmp3);
    putchar(tmp2);
    putchar(tmp1);
  }

}