/************************************************************************
	URLデコードプログラム
				copyright 2004, TKEN
************************************************************************/
#include <stdio.h>

static int urldecode_internal( char *, char * );
 
int
main( int argc, char **argv )
{
	static	unsigned char tmpbuf[4096];
	static	unsigned char result[4096];

	tmpbuf[4095] = '\0';

	while( fgets( tmpbuf, 4096, stdin ) != NULL ) {

		if ( tmpbuf[4095] != '\0' ) {
			fprintf( stderr, "Too long line\n" );
			exit(1);
		}

		urldecode_internal( tmpbuf, result );

		printf( result );
	}

	return 0;
}

static
int
urldecode_internal( char *src, char *result ) 
{
	int	i;
	int	len;
	int	j;


	i = 0;
	j = 0;

	if ( src[0] == '\0' ) {
		result[0] = '\0';
		return 1;
	}


	len = strlen( src );

	while ( src[i] != '\0' ) {

		if ( src[i] == '+' ) {
			result[j] = ' ';

			i++;
			j++;
			continue;
		} 

		if ( src[i] == '%' ) {

			if ( i >= len - 2 ) {
				return 0;
			}


			switch ( src[i+1] ) {

				case '0':
					result[j] = 0;
					break;
				case '1':
					result[j] = 16;
					break;
				case '2':
					result[j] = 32;
					break;
				case '3':
					result[j] = 48;
					break;
				case '4':
					result[j] = 64;
					break;
				case '5':
					result[j] = 80;
					break;
				case '6':
					result[j] = 96;
					break;
				case '7':
					result[j] = 112;
					break;
				case '8':
					result[j] = 128;
					break;
				case '9':
					result[j] = 144;
					break;
				case 'a':
					result[j] = 160;
					break;
				case 'A':
					result[j] = 160;
					break;
				case 'b':
					result[j] = 176;
					break;
				case 'B':
					result[j] = 176;
					break;
				case 'c':
					result[j] = 192;
					break;
				case 'C':
					result[j] = 192;
					break;
				case 'd':
					result[j] = 208;
					break;
				case 'D':
					result[j] = 208;
					break;
				case 'e':
					result[j] = 224;
					break;
				case 'E':
					result[j] = 224;
					break;
				case 'f':
					result[j] = 240;
					break;
				case 'F':
					result[j] = 240;
					break;
				default:
					return 0;
			}
			switch ( src[i+2] ) {

				case '0':
					result[j] += 0;
					break;
				case '1':
					result[j] += 1;
					break;
				case '2':
					result[j] += 2;
					break;
				case '3':
					result[j] += 3;
					break;
				case '4':
					result[j] += 4;
					break;
				case '5':
					result[j] += 5;
					break;
				case '6':
					result[j] += 6;
					break;
				case '7':
					result[j] += 7;
					break;
				case '8':
					result[j] += 8;
					break;
				case '9':
					result[j] += 9;
					break;
				case 'a':
					result[j] += 10;
					break;
				case 'A':
					result[j] += 10;
					break;
				case 'b':
					result[j] += 11;
					break;
				case 'B':
					result[j] += 11;
					break;
				case 'c':
					result[j] += 12;
					break;
				case 'C':
					result[j] += 12;
					break;
				case 'd':
					result[j] += 13;
					break;
				case 'D':
					result[j] += 13;
					break;
				case 'e':
					result[j] += 14;
					break;
				case 'E':
					result[j] += 14;
					break;
				case 'f':
					result[j] += 15;
					break;
				case 'F':
					result[j] += 15;
					break;
				default:
					return 0;
			}

			i = i + 3;
			j++;
			continue;
		}

		result[j] = src[i];

		i++;
		j++;
	}

	result[j] = '\0';
	return 1;
}