#include <bits/stdc++.h>
using namespace std;
typedef int l;
typedef long long ll;
#define ft freopen("input.txt", "r", stdin)
#define ftt freopen("output2.txt", "w", stdout)
#define loop(a, b) for(int i = a; i < b; i++)
#define max 100005
#define PI acos(-1.0)

int main()
{
    //ft;
    //ftt;
    char s[max];
    l c = 0;
    while(scanf(" %[^\n]", &s) != EOF){
        if(c != 0) cout << endl;
        l p = strlen(s);
        loop(0, p){
            if(s[i] == 32 && s[i+1] == 32) cout << s[i+1];
            else if((s[i]==32) && (s[i+1] == ',' || s[i+1] == '.')){
                cout << s[i+1];
            }
            else if(s[i] == 32 && s[i-1] == 32) continue;
            else if((s[i] == ',' || s[i] == '.') && s[i-1] != 32) cout << s[i];
            else {
                if ((s[i] != ',' && s[i] != '.')) cout << s[i];
            }
        }
        //cout << endl;
        c++;
    }

    return 0;
}

// abc def .
// abc  def   .
// abc  ,  def.
// abc, def.
// abc,   def, hi.