//////////////////////////////////////////////////////////////////////////

 //        POJ1028 Web Navigation

 //        Memory: 264K        Time: 47MS

 //        Language: C++        Result: Accepted

 //////////////////////////////////////////////////////////////////////////

 #include <iostream>

 #include <string>

 #include <stack>

 using namespace std;

 stack<string> forwardStack;

 stack<string> backwardStack; 

 void clearForwardStack() {

     while (!forwardStack.empty()) {

         forwardStack.pop();

     }

 }

 int main() {

     string operation;

     string currentURL = "http://www.acm.org/";

     string nextURL;

     while (cin >> operation && operation != "QUIT") {

         switch (operation[]) {

             case 'V':

                 cin >> nextURL;

                 backwardStack.push(currentURL);

                 currentURL = nextURL;

                 cout << currentURL << endl;

                 clearForwardStack();

                 break;

             case 'B':

                 if (backwardStack.empty()) {

                     cout << "Ignored" << endl;

                 } else {

                     forwardStack.push(currentURL);

                     currentURL = backwardStack.top();

                     cout << currentURL << endl;

                     backwardStack.pop();

                 }

                 break;

             case 'F':

                 if (forwardStack.empty()) {

                     cout << "Ignored" << endl;

                 } else {

                     backwardStack.push(currentURL);

                     currentURL = forwardStack.top();

                     cout << currentURL << endl;

                     forwardStack.pop();

                 }

                 break;

         }

     }

     system("pause");

     return ;

 }