#include<bits/stdc++.h>
using namespace std;

using i64 = long long;
using u64 = unsigned long long;

struct debug {
#define contPrint { *this << "["; \
        int f = 0; for(auto it : x) { *this << (f?", ":""); *this << it; f = 1;} \
        *this << "]"; return *this;}
 
    ~debug(){cerr << endl;}
    template<class c> debug& operator<<(c x) {cerr << x; return *this;}
    template<class c, class d>
    debug& operator<<(pair<c, d> x) {*this << "(" << x.first << ", " << x.second << ")"; 
        return *this;}
    template<class c> debug& operator<<(vector<c> x) contPrint;
    template<class c> debug& operator<<(deque<c> x) contPrint;
    template<class c> debug& operator<<(set<c> x) contPrint;
    template<class c> debug& operator<<(multiset<c> x) contPrint;
    template<class c, class d> debug& operator<<(map<c, d> x) contPrint;
    template<class c, class d> debug& operator<<(unordered_map<c, d> x) contPrint;
#undef contPrint
};

#define dbg(x) "[" << #x << ": " << x << "]  "
#define Wa() cerr << "[LINE: " << __LINE__ << "] -> "; debug() << 
#define FASTIO ios_base::sync_with_stdio(false); cin.tie(NULL);

const int N = 1e6 + 6;
char ch[N];
vector<int> pos[N];

int main()
{
    vector<string> v;
    while(scanf("%s", ch) != EOF) {
        string s = ch;
        if(s.back() == '.' || s.back() == ',') s.pop_back();
        v.push_back(string(ch));
    }

    int sz = (int)v.size();

    vector<int> str_ids(sz);

    {
        map<string, int> id;

        int cur = 1;

        for(int i = 0; i < sz; i++) {
            auto it = v[i];
            if(it.back() == ',' || it.back() == '.') it.pop_back();
            if(id[it] == 0) {
                id[it] = cur++;
            }
            str_ids[i] = id[it];
        }
    }

    // map<int, vector<int>> pos;
    for(int i = 0; i < sz; i++) {
        pos[str_ids[i]].push_back(i);
    }

    queue<pair<int, int>> q;
    set<int> bef, aft;

    for(int i = 0; i < sz; i++) {
        if(i) {
            if(v[i-1].back() == ',') {

                if(v[i].back() == '.') {
                    // v[i].pop_back();
                    bef.insert(str_ids[i]);
                    q.push({str_ids[i], 0});
                    // v[i].push_back('.');

                } else if (v[i].back() == ','){
                    // v[i].pop_back();
                    bef.insert(str_ids[i]);
                    q.push({str_ids[i], 0});
                    // v[i].push_back(',');

                } else {
                    bef.insert(str_ids[i]);
                    q.push({str_ids[i], 0});
                }
            }
        }

        if(v[i].back() == ',') {
            v[i].pop_back();
            aft.insert(str_ids[i]);
            q.push({str_ids[i], 1});
            v[i].push_back(',');
        }
    }

    while(!q.empty()) {
        auto [cur, t] = q.front(); q.pop();

        // Wa() dbg(cur) dbg(t) dbg(pos[cur]);

        if(t == 0) {
            for(int p : pos[cur]) {
                if(p) {
                    char c = '#';

                    if(v[p-1].back() == '.' || v[p-1].back() ==',') {
                        c = v[p-1].back();
                        v[p-1].pop_back();
                    }

                    if(c == '#' && aft.find(str_ids[p-1]) == aft.end()) {


                        q.push({str_ids[p-1], 1});
                        aft.insert(str_ids[p-1]);

                    }

                    if(c != '#') {
                        v[p-1].push_back(c);
                    }
                }
            }
        }

        if(t == 1) {
            for(int p : pos[cur]) {
                if(p < sz-1) {
                    if(v[p].back() == '.') continue;

                    char c = '#';

                    if(v[p+1].back() == '.' || v[p+1].back() == ',') {
                        c = v[p+1].back();
                        v[p+1].pop_back();
                    }

                    if(bef.find(str_ids[p+1]) == bef.end()) {
                        q.push({str_ids[p+1], 0});
                        bef.insert(str_ids[p+1]);
                    }

                    if(c != '#') {
                        v[p+1].push_back(c);
                    }
                }
            }
        }
    }

    // Wa() dbg(bef) dbg(aft);

    for(int i = 0; i < sz; i++) {

        auto s = v[i];
        if(s.back() == ',' || s.back() == '.') s.pop_back();

        if(aft.find(str_ids[i]) != aft.end()) {
            if(v[i].back() != '.' and v[i].back() != ',') {
                v[i] += ',';
            }
        }

        if(i) {
            if(bef.find(str_ids[i]) != bef.end()) {
                if(v[i-1].back() != '.' && v[i-1].back() != ',') {
                    v[i-1] += ',';
                }
            }
        }
    }

    // Wa() dbg(aft) dbg(bef);

    for(int i = 0; i < sz; i++) {
        if(i) printf(" ");
        printf("%s", v[i].c_str());
    }
    puts("");
}