#include <iostream>
#include <stack>
#include <string>
using namespace std;
//抄博友程序 没掌握
int main()
{
string cur;
//cur="http://www.acm.org/";
stack<string> forward;
stack<string> back;
back.push("http://www.acm.org/");//抄博友
while(1)
{
string com;
cin>>com;
if(com=="VISIT")
{
string s;
cin>>s;
back.push(s);
cur=s;
while(forward.empty()!=1)
{
forward.pop();
}
cout<<cur<<endl;
}else if(com=="QUIT")
{
break;
}else if(com=="BACK")
{
//forward.push(cur);
//if(back.empty()!=1)
if(back.size()>1)//抄博友
{
cur=back.top();
back.pop();
forward.push(cur);//抄博友
cout<<back.top()<<endl;//抄博友
}else
{
cout<<"Ignored"<<endl;
}
}else if(com=="FORWARD")
{
//back.push(cur);
if(forward.empty()!=1)
{
cur=forward.top();
back.push(cur);//抄博友
forward.pop();
cout<<cur<<endl;
}else
{
cout<<"Ignored"<<endl;
}
}
}
return 0;
}
