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

int main()
{
	char string1[80];
	char string2[80];

	int lastWhite = 0;
	int c = 0;

	gets(string1);

	for(int i = 0; i < strlen(string1); i++)
	{
		if(lastWhite == 0 && string1[i] == ' ')
		{
			string2[c] = string1[i];
			lastWhite = 1;
			c++;
		}
		else if(string1[i] != ' ')
		{
			string2[c] = string1[i];
			lastWhite = 0;
			c++;
		}
	}
	string2[c] = '\0';
	puts(string2);

	return 0;
}