// 2022 IUSB Programming Competition
// Round 1 Problem 3
// Text Editing
// Solution by Liguo Yu

import java.util.Scanner;

public class round1_p3
{	
    public static void main(String[] args)
    {
        Scanner input = new Scanner(System.in);
        String myinput = input.nextLine();
        
        String result = remove(myinput);
        System.out.println(result);
    }
    
    public static String remove(String s)
    {              
        String result = "";
        boolean space_flag = false;
        boolean begining = true;
        
        for (int i=0; i<s.length(); i++)
        {
            char c = s.charAt(i);

            if (c != ' ')
            {
                if(begining == false && space_flag == true && c != '.' && c != ',' && c != '?')
                {
                    result = result + ' ';
                }
                result = result + c;
                begining = false;
                space_flag = false;
            }
            else // (c == ' ')
            {
                if(space_flag == false)
                {
                    space_flag = true;
                }
            }
                
        }       
        return result;
    }
}