/* package whatever; // don't place package name! */

import java.util.*;
import java.lang.*;
import java.io.*;


public class Main
{
	private static BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
	//private static StreamTokenizer in = new StreamTokeniser();
	//private static Scanner in = new Scanner(System.in);
	
	public static void main (String[] args) throws java.lang.Exception
	{
		StringBuilder a;
		a = new StringBuilder(in.readLine());
		int j = 0;
		boolean isSpace = false;
		if(a.length() == 0) System.exit(0);
		for(int i = 0; i < a.length(); i++){
			if(a.charAt(i) == ' '){
				if(!isSpace){
					isSpace = true;
					a.setCharAt(j,a.charAt(i));
					j++;
				}
			}
			else{
				isSpace = false;
				a.setCharAt(j,a.charAt(i));
				j++;
			}
		}
		a.delete(j, a.length());
		if(a.charAt(a.length() - 1) == ' ') a.delete(a.length() - 1, a.length());
		System.out.println(a);
	}
}