/*
 * Prints an int in hexadecimal, but in reverse
 *
 */

#include <stdio.h>

void print_hex(int x);

int main(int argc, char *argv[])
{
  int x;
  scanf("%d", &x);
  print_hex(x);
  return 0;
}

void print_hex(int x)
{
  while(x) {
    int r = x % 16;
    if(r > 9) {
      printf("%c", 'a' + (r - 10));
    } else {
      printf("%d", r);
    }
    x /= 16;
  }
  printf("\n");
}