#include <stdio.h>
#include <stdlib.h>

int main(){
	int c = 0;
	_Bool lastWS = 0;

	while((c = getchar()) != EOF){
		if(c == '\t' || c == ' '){
			if(lastWS == 0){
				lastWS = 1;
				putchar(c);
			}
		}
		else{
			lastWS = 0;
			putchar(c);
		}
	}
	putchar('\n');
	exit(0);
}