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/*
* Copyright (C) 2014 Tomasz Kramkowski <tk@the-tk.com>
*
* This program is free software. It is licensed under version 3 of the
* GNU General Public License.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see [http://www.gnu.org/licenses/].
*/
#include <stdio.h>
int main(int argc, char **argv)
{
int c;
while((c = getchar()) != EOF)
if(isdigit(c) || c == '\n')
putchar(c);
}
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