//*****************************
//* ???????????    *
//* ??????              *
//* ???2010-12-8           *
//* ??????????      *
//*****************************
int main()
{
	char s[100],*p = s;
	int i = 0;
	gets(s);
	while(p - s + 1 <= strlen(s))
	{
		if(*p != ' ')
			i = 0;
		if(*p == ' ')
			i++;
		if(i <= 1)
			cout << *p;
		p++;
	}
	return 0;
}