#include <stdio.h>

#define NORMAL 0
#define SPACEBARING 1

// trimming excessive spacebars down to one

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;
				putchar(c);
			}
		}
	}
}