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

vector<pair<int, int> >  v[200];
queue<char> q;
int us[200], kol [200];
string s[110];

int main()
{
//  freopen("epsilon.in", "r", stdin);
//  freopen("epsilon.out", "w", stdout);
    int n, m;
    char c;
    cin>> n>> c;
    getline(cin, s[0]);
    cout << "asas"<<' '<<s[0]<<'\n';
    for(int i = 1; i <= n; i ++){
        getline(cin, s[i]);
        if(s[i][s[i].size() - 1] == '>'){
            us[s[i][0]] = 1;
            q.push(s[i][0]);
        }
        for(int j = 5; j < s[i].size(); j ++){
            if(s[i][j] >= 'A' && s[i][j] <= 'Z'){
                //cout<< s[i][0]<<' '<<s[i][j]<<'\n';
                v[s[i][j]].push_back(make_pair(i, j));
            }
        }
    }


    while(!q.empty()){
        char st = q.front();
        q.pop();
        //cout << st<<'\n';
        for(pair<int, int> i : v[st]){
            if(s[i.first][i.second] != '#'){
                s[i.first][i.second] = '#';
                kol[i.first]++;
                if(kol[i.first] == s[i.first].size() - 5 && us[s[i.first][0]] == 0){
                    us[s[i.first][0]] = 1;
                    q.push(s[i.first][0]);
                }
            }
        }
    }
    int q = 0;
    for(char i = 'A'; i <= 'Z'; i ++){
        if(us[i] == 1){
            if(q){
                cout <<' ';
            }
            q = 1;
            cout <<i;
        }
    }

}