> #include <stdio.h>
> #include <string.h>
> #include <malloc.h>
> 
> void main(){
> 	int i=0;
> 	int ii=0;
> 	int n=-1;
> 	char act[8];//what does it want to do.
> 	char rcd[101][71];//the record
> 	char url[101][71];//the url.
> 	strcpy(url[0],"http://www.acm.org/");
> 	scanf("%s",&act);
> 	for(;act[0]!='Q';){
> 		n++;
> 		if(act[0]=='V'){
> 			i++;
> 			ii++;
> 			scanf("%s",url[i]);
> 			strcpy(rcd[n],url[i]);
> 		}
> 		else if(act[0]=='B'){
> 			i--;
> 			if(i<0){
> 				i=0;
> 				strcpy(rcd[n],"Ignored");
> 			}
> 			else strcpy(rcd[n],url[i]);
> 		}
> 		else if(act[0]=='F'){
> 			i++;
> 			if(i>ii){
> 				i--;
> 				strcpy(rcd[n],"Ignored");
> 			}
> 			else {
> 				strcpy(rcd[n],url[i]);
> 			}
> 		}
> 		scanf("%s",&act);
> 	}
> 	for(i=0; i<=n; i++)
> 		printf("%s\n",rcd[i]);
> }