#include<stdio.h>

int main(int argc, char **argv)
{
  int c[16],p[16],i,j,count=0,flag=0;
  FILE *ifp;

  if(argv[1])
	ifp=fopen(argv[1],"r");
  else
	ifp=stdin;
  while(1){
	printf("%5x:",count);
	for(i=0;i<16;i++){
		c[i]=getc(ifp);
		if(c[i]==EOF){
			flag=1;
			c[i]=0;
			}
		if(c[i]<32 || c[i] > 127)
			p[i]='.';
		else
			p[i]=c[i];
		printf("%2x ",c[i]);
		}
	for(i=0;i<16;i++)
		putchar(p[i]);
	putchar('\n');
	count+=16;
	if(flag==1)
		break;
	}
  fclose(ifp);
  return 0;
}