#include <unistd.h>

#define BUFFER_SIZE 4096

int main ()
{
  ssize_t len, i;
  unsigned char buf[BUFFER_SIZE];

  for (;;) {
    len = read(0, buf, BUFFER_SIZE);
    if (len < 0) exit(1);
    if (!len) break;
    for (i = 0; i < len; ++i) {
      switch (buf[i]) {
        case 'A'...'Z':
          buf[i] += 13;
          buf[i] -= (buf[i] > 'Z') * 26;
          break;
        case 'a'...'z':
          buf[i] += 13;
          buf[i] -= (buf[i] > 'z') * 26;
          break;
      }
    }
    write(1, &buf[0], len);
  }
  return 0;
}