#include <stdio.h>
#include <ctype.h>

#define ctoi(c) ( (c) <= '9' ? (c)-'0' : (c) - 'a' + 10)

/*
 * htd()
 * {
 * 	perl -pe 's/\%([A-Fa-f0-9]{2})/pack("C", hex($1))/seg;'
 * }
 */

int main(int argc, char **argv)
{
	unsigned char c,d;

	for( c=getchar(); (!feof(stdin)); c=getchar())
	{
		if ( c=='%' )
		{
			d=getchar();
			if ( isxdigit(d) )
			{
				d=tolower(d);
				c=(unsigned char)(16*ctoi(d));
				d=tolower(getchar());
				c+=(unsigned char)(ctoi(d));
			}
			else
				c=d;
		}
		putchar(c);
	}
	return(0);
}