#include <stdio.h>

/* Procedure to print d as a hex digit. */
void PrintHexDigit(int d)
{
    if (d<10) printf("%c", '0'+d);
    else printf("%c", 'A'+d-10);
}

/* Procedure to print i as two hex digits.  */
void PrintHex2(int i)
{
    PrintHexDigit((i / 16) % 16);
    PrintHexDigit(i % 16);
}

void main()
{
  int x, y;

  for (x=0; x<=15; x++) { 
    PrintHex2(x*16); printf(":");
    for (y=0; y<=15; y++) {
      printf(" ");
      PrintHex2(x*y);
    }
    printf("\n");
  }
}