#include<bits/stdc++.h>
#define f first
#define s second
#define ld long double
#define pb push_back
#define ll long long
#define sz(x) (int)(x).size()
using namespace std;

int main(){
    int n;
    vector<string> words;
    vector<bool> hasComma,hasDot;
    string in;
    set<pair<string,int>> before,after;
    while(cin>>in){
        if(sz(in)==0)break;
        if(in[sz(in)-1]==','){
            in=in.substr(0, sz(in)-1);
            hasComma.pb(1);
        }
        else{
            hasComma.pb(0);
        }
        if(in[sz(in)-1]=='.'){
            in=in.substr(0, sz(in)-1);
            hasDot.pb(1);
        }
        else{
            hasDot.pb(0);
        }
        words.pb(in);
    }
    queue<string> qb,qa;
    for(int i=0;i<sz(words);i++){
        if(i!=0){
            if(!hasComma[i-1]&&!hasDot[i-1]){
                before.insert({words[i],i-1});
            }
            if(hasComma[i-1]){
                qb.push(words[i]);
            }
        }
        if(!hasComma[i]&&!hasDot[i]){
            after.insert({words[i],i});
        }
        if(hasComma[i]){
            qa.push(words[i]);
        }
    }
    while(sz(qb)||sz(qa)){
        while(sz(qb)){
            string tr=qb.front();
            //cout << "before " << tr << endl;
            qb.pop();
            while(1){
                //cout << tr << endl;
                auto it=before.lower_bound({tr,0});
                if(it!=before.end()&&(*it).f==tr){
//cout << sz(before) << endl;
                    int pos=(*it).s;
                    if(!hasComma[pos]){
                        hasComma[pos]=1;
                        qa.push(words[pos]);
                        if(pos!=sz(hasComma)-1){
                            qb.push(words[pos+1]);
                        }
                    }
                    before.erase(it);
                }
                else{
                    break;
                }
            }
        }
        while(sz(qa)){
            string tr=qa.front();
            //cout << "after " << tr << endl;
            qa.pop();
            while(1){
                auto it=after.lower_bound({tr,0});
                if(it!=after.end()&&(*it).f==tr){
                    int pos=(*it).s;
                    if(!hasComma[pos]){
                        hasComma[pos]=1;
                        qa.push(words[pos]);
                        if(pos!=sz(hasComma)-1){
                            qb.push(words[pos+1]);
                        }
                    }
                    after.erase(it);
                }
                else{
                    break;
                }
            }
        }
    }
    //cout << "done" << endl;
    for(int i=0;i<sz(words);i++){
        cout << words[i];
        if(hasComma[i])cout << ",";
        if(hasDot[i])cout << ".";
        cout << " ";
    }
    cout << endl;
}