#include<stdio.h>
#include<string.h>
int main(){
    int n;
    int arr[100],size=0;
    char cmd[20];
    int x;
    scanf("%d",&n);
    for(int i=0;i<n;i++){
        scanf("%s",cmd);
        if(strcmp(cmd,"join_front")==0){
            scanf("%d",&x);
            for(int j=size;j<0;j--){
                arr[j]=arr[j-1];
            }
            arr[0]=x;
            size++;
        }
    else if(strcmp(cmd,"issue")==0){
        if(size>0){
            for(int j=0;j<size-1;j++){
                arr[j]=arr[j+1];
            }
            size--;
        }
    }
    else if(strcmp(cmd,"display")==0){
        if(size==0){
            printf("No VIPs in queue\n");
        }
        else{
            for(int j=0;j<size;j++){
                printf("%d",arr[i]);
            }
    }
    }
    return 0;
}