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

main()
{
	static char str[] = "hello, world";
	char *ptr;

	ptr = strtok(str, " ,");
	printf("%s\n", ptr);
	ptr = strtok(NULL, " ,");
	printf("%s\n", ptr);
	ptr = strtok(NULL, " ,");
	printf("%s\n", ptr);

	exit(0);
}