#include<iostream>
#include <bits/stdc++.h>

#define ll long long
#define ld long double
#define IO ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

using namespace std;
const int N = 2e6 + 2, MOD = 998244353;

map<string, int> id;

int getID(string s) {
    if (s.back() == '.')s.pop_back();
    if (s.back() == ',')s.pop_back();

    if (id.find(s) == id.end())id[s] = id.size();
    return id[s];
}


vector<pair<string, int>> getWords(string &s) {
    vector<pair<string, int>> v;
    string temp = "";
    s += " ";
    for (auto i: s) {
        if (i == ' ') {
            v.push_back({temp, getID(temp)});
            temp = "";
        } else {
            temp += i;
        }
    }
    return v;
}

vector<int> adj_before[N], adj_after[N];

void doWork() {
    string s;
    getline(cin, s);
    vector<pair<string, int>> v = getWords(s);

    queue<int> q_after, q_before;

    for (int i = 0; i < v.size(); i++) {
        adj_before[v[i].second].push_back(i);
        adj_after[v[i].second].push_back(i);

        if (v[i].first.back() == ',') {
            q_after.push(i);
        }
        if (i && v[i - 1].first.back() == ',') {
            q_before.push(i);
        }
    }

    while (!q_after.empty() || !q_before.empty()) {
        if (!q_after.empty()) {
            int node = q_after.front();
            q_after.pop();

            int g = v[node].second;
            for (auto i: adj_after[g]) {
                if (v[i].first.back() == '.' || v[i].first.back() == ',')continue;
                v[i].first += ',';
                if (i + 1 < v.size()) {
                    q_before.push(i + 1);
                }
            }
            adj_after[g].clear();
        } else {
            int node = q_before.front();
            q_before.pop();

            int g = v[node].second;
            for (auto i: adj_before[g]) {
                if (i == 0 || v[i - 1].first.back() == '.' || v[i - 1].first.back() == ',')continue;
                v[i - 1].first += ',';
                q_after.push(i - 1);
            }
            adj_before[g].clear();
        }
    }
    for (auto i: v) {
        cout << i.first << " ";
    }
}

int main() {
    IO
    int t = 1;
//    cin >> t;
    for (int i = 1; i <= t; i++) {
        //  cout << "Case #" << i << ": ";
        doWork();
    }
}