#include <iostream>
#include <string>
#include <fstream>

using namespace std;

int main()
{
    ifstream cin("input.txt");
    ofstream cout("output.txt");
    const char r = ' ';
    const string z(",.!?");
    string s;
    string str;
    while(getline(cin, str))
    {
        s += str + ' ';
    }
    if(s.length() && s[0] == r)
        s.erase(0, s.find_first_not_of(r));

    cout << s;
    cin.close();
    cout.close();
    return 0;
}