#include <iostream>#include <vector>#include <string>

using namespace std;
int main()
{    string current = "http://www.acm.org/";    vector<string> back_history(0);    vector<string> forw_history(0);
    string line;    cin>>line;    while(line!="QUIT"){        if(line == "VISIT"){            cin>>line;            back_history.push_back(current);            forw_history.clear();            current = line;            cout<<current<<endl;        }else if(line == "BACK"){            if(back_history.size()==0){                cout<<"Ignored"<<endl;            }else{                line = back_history.back();                back_history.pop_back();                forw_history.push_back(current);                current = line;                cout<<current<<endl;            }        }else if(line == "FORWARD"){            if(forw_history.size()==0){                cout<<"Ignored"<<endl;            }else{                line = forw_history.back();                forw_history.pop_back();                back_history.push_back(current);                current = line;                cout<<current<<endl;            }        }        cin>>line;    }
    return 0;
}