POJ1028

#include<iostream>
#include<string>
using namespace std;
int main()
{
	string websites[102];
	websites[1] = "http://www.acm.org/";

	string str,tmp;
	int i = 1,max;
	while(cin>>str && (str[0] != 'Q')){
		if(str[0] == 'V')
		{
			cin>>tmp;
			websites[++i] = tmp;
			max = i;
			cout<<tmp<<endl;
			
		}
		else if(str[0] == 'B'){
			if(i>1){
				cout<<websites[--i]<<endl;
			}
			else{
				cout<<"Ignored"<<endl;
			}
		}
		else if(str[0] == 'F'){
			if(i >= max){
				cout<<"Ignored"<<endl;
			}else{
				cout<<websites[++i]<<endl;
			}
		}
	}
}