#include <stdio.h>
#define NORMAL 0
#define SPACEBARING 1
main()
{
int c;
int state = NORMAL;
while ((c = getchar()) != EOF)
if (state == NORMAL)
putchar(c);
if (c == ' ')
state = SPACEBARING;
}
if (state == SPACEBARING)
if (c != ' ')
state = NORMAL;