#include <stack>

#include <string>

#include <cstdio>

#include <cstring>

#include <iostream>

#include <algorithm>

using namespace std;

string s, ss;

stack <string> s1, s2;

string q[];

int cnt = , maxx = ;

int main()

{

    q[] = "http://www.acm.org/";

    while (cin >> s && s != "QUIT")

    {

        if (s == "VISIT")

        {

            cin >> ss;

            q[++cnt] = ss;

            maxx = cnt;

            cout << ss << endl;

        }

        else

            if (s == "BACK")

            {

            if (cnt -  <= )

                printf("Ignored\n");

            else

            {

                cnt--;

                cout << q[cnt] << endl;

            }

            }

            else

            {

                if (cnt +  > maxx)

                    printf("Ignored\n");

                else

                {

                    cnt++;

                    cout << q[cnt] << endl;

                }

            }

    }

return ;

}