#include<stdio.h>
#include<stdbool.h>
#include<string.h>
#define max 100

int q[max];
int front=-1,rear=-1;
int size;
bool isFull(){
    return((front==0 && rear==size-1)|| front==rear+1));
}
bool isEmpty(){
    return(front==-1);
}
void insertFront(int x){
    if(isFull())return;
    if(isEmpty()){
        front=rear=0;
    }
    else if(front==0){
        front=size-1;
    }else{
        front--;
    }
    q[front]=x;
}
void insertLast(int x){
    if(isFull())return;
    if(isEmpty()){
        front=rear=0;
    }
    else if(rear==size-1){
        rear=0;
    }else{
        rear++;
    }
    q[rear]=x;
}

void deleteFront(){
    if(isEmpty())return;
    if(front==rear){
        front=rear=-1;
    }else if(front=size-1){
        front=0;
    }else{
        front++;
    }
}

void deleteLast(){
    if(isEmpty())return;
    if(front==rear){
        front=rear=-1;
    }else if(rear==0){
        rear=size-1;
    }else{
        rear--;
    }
}

int getFront(){
    if(isEmpty())return-1;
    return q[front];
}

int getRear(){
    if(isEmpty())return-1;
    return q[rear];
}

int main(){
    int n;
    scanf("%d",&n);
    while(scanf("%s",op)!=EOF){
        if(strcmp(op,"insertFront")==0){
            scanf("%d",&x);
            insertFront(x);
        }
        else if(strcmp(op,"insertLast")==0){
            scanf("%d",&x);
            insertLast(x);
        }
        else if(strcmp(op,"deleteFront")==0){
            deleteFront();
        }
        else if(strcmp(op,"deleteLast")==0){
            deleteLast();
        }
        else if(strcmp(op,"getFront")==0){
            int val=getFront();
            if(val!=-1)
                printf("%d\n",val);
        }
        else if(strcmp(op,"getRear")==0){
            int val=getRear();
            if(val!=-1)
                printf("%d\n",val);
        }
        else if(strcmp(op,"isEmpty")==0){
           printf(isEmpty()?"true\n":"false\n"); 
    }
    else if(strcmp(op,"isFull")==0){
           printf(isFull()?"true\n":"false\n"); 
    }
}
return 0;
}