#include <iostream>
#include <vector>
#include <string>
using namespace std;
 
int main()
{
        vector<string> v;
        vector<string>::iterator p;
 
        string c,s;
        v.push_back("http://www.acm.org/");
        p=v.end();
        while(cin >> c) {
                if(c=="QUIT") break;
                if(c=="VISIT") {
                        cin >> s;
                        cout << s << endl;
 
                        v.erase(p, v.end());
                        v.push_back(s);
                        p=v.end();
                } else if(c=="BACK") {
                        if(p==v.begin()+1) cout << "Ignored\n";
                        else {
                                --p;
                                cout << *(p-1) << endl;
                        }
                } else if(c=="FORWARD") {
                        if(p==v.end()) cout << "Ignored\n";
                        else {
                                ++p;
                                cout << *(p-1) << endl;
                        }
                }
        }
 
        return 0;
}