#include"stdio.h"
#include"string.h"
void main()
{
	char a[120][120];
	char r[120][120];
	char s[120];
	int i,j=0,max=0;
	strcpy(a[0],"http://www.acm.org/");
	i=0;
	while(gets(s)&&s[0]!='Q')
	{
		if(s[0]=='V')
		{
			i++;
			max=i;
		strcpy(a[i],s+6);
			strcpy(r[j++],a[i]);
			continue;
		}
		if(s[0]=='F')
		{
			i++;			
			if(i>max)
			{
					i=max;
					strcpy(r[j++],"Ignored");
			}
			else
			
				strcpy(r[j++],a[i]);
			continue;
		}
		if(s[0]=='B')
		{
			i--;
			if(i==-1)
			{
				i=0;
				strcpy(r[j++],"Ignored");
			}
			else
					strcpy(r[j++],a[i]);
		}
	}
	for(i=0;i<j;i++)
		printf("%s\n",r[i]);
}