#include <stdio.h>
#include <string.h>
#include <stdlib.h>

unsigned char hexvalue(char c)
{
if(c >= '0' && c <= '9')
	return(c-'0');
if(c >= 'A' && c <= 'F')
	return(c-'A'+10);
if(c >= 'a' && c <= 'f')
	return(c-'a'+10);
}

main(int argc, char **argv)
{
int	x,y,z;
int	size;
int	pos;
char	*s;
unsigned char	c,d;
pos=0;
s=argv[1];
size = strlen(s);
while(pos < size)
	{
	c = s[pos++];
	if(c == '+')
		putc(' ',stdout);
	else if(c == '%')
		{
		c = s[pos++];
		x = hexvalue(c);
		c = s[pos++];
		x = x*16+hexvalue(c);
		putc(x,stdout);
		}
	else
		putc(c,stdout);
	}
}