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

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

	while((c = getchar()) != EOF){
		//Check if the current character is a whitespace
		if(c == '\t'|| c == ' '){
			if(lastWS == 0){
				//If the last character was not also WS, set lastWS 1 and print
				lastWS = 1;
				putchar(c);
			}//If c is WS and last was WS, statement fails.
		}
		else{
			//If not WS, set lastWS 0 and print.
			lastWS = 0;
			putchar(c);
		}
	}
	putchar('\n');
	exit(0);
}