#include <stdio.h>
int main()
{
    char s[100][70],c[10];
    int i=1;
    strcpy(s[1],"http://www.acm.org/");
    while(scanf("%s",c)&&strcmp(c,"QUIT"))
    {
        
        if(!strcmp(c,"VISIT"))
        {
            i++;
            scanf("%s",s[i]);
            printf("%s\n",s[i]);            
        }
        if(!strcmp(c,"BACK"))
        {
            if(strlen(s[--i])>0) 
            printf("%s\n",s[i]);
            else {printf("Ignored\n");i++;}
        }
        if(!strcmp(c,"FORWARD"))
        {
            if(strlen(s[++i])>0) 
            printf("%s\n",s[i]);
            else {printf("Ignored\n");i--;}
        }
    }
}