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

#include <iostream>
#include <string>
using namespace std;

string remove(string s);

int main()
{
	char input[300];
	cin.getline(input, 300);

	string myinput = input;

	string result = remove(myinput);

	cout << result;

  return 1;
}

string remove(string s)
{
	string result = "";
	bool space_flag = false;
	bool begining = true;

	for (int i = 0; i < s.length(); i++)
	{
		char c = s.at(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;
}