int main()
{
	char str[100];
	cin.getline(str, 100);
	int i, j;int count = 0;
	for (i = 0; str[i] != '\0'; i ++)
	{
		
		if(str[i] == ' ')
			count ++;
		if (count == 1 && str[i] != ' ')
		 count = 0;
		if( count >= 2 && str[i] != ' ')
		{
			for (j = i - count + 1; str[j] != '\0'; j ++)
			 str[j]=str[j + count - 1];
			i -= count;
			count = 0;
		}
		
	}
	cout << str << endl;
	return 0;
}