#include <stdio.h>

/*  HEX standard input to standard output */

main()
{	short	c;
	short	hi, low;

while ( (c=getchar())!=EOF ) {
	hi=c/16;low=c-16*hi;
	if(hi>9) putchar('A'+hi-10);
	else putchar(hi+'0');
	if(low>9) putchar(low+'A'-10);
	else putchar(low+'0');
	}
putchar('\n');
}