/*  Launo Tuuri --- C-ohj (Taina) s97 --- Laskarit / tehtävä:  1 / 3  */

#include <stdio.h>

int main()
{
    int a, b;
    a = b = 0;
    while (b != EOF && (a = getchar()) != EOF) {
	if (a == ' ' || a == '\t' || a == '\n') {
	    while ((b = getchar()) == a && b != EOF);
	    putchar(a);
	    if (b != EOF)
		putchar(b);
	}
	else
	    putchar(a);
    }
    return 0;
}