#include<stdio.h>
#include<stdlib.h>
#include<string.h>

struct node{
	unsigned int key;
	struct node *next;
	struct node *prev;
};

typedef struct node * NodePointer;

NodePointer nil;

NodePointer listSearch(int key){
	NodePointer cur = nil->next;
	while(1){
		if ( cur == nil ) break;
		if (cur->key == key) return cur;
		cur = cur->next;
	}
	return nil;
}

void init(){
	nil = (NodePointer) malloc(sizeof(struct node));
	nil->next = nil;
	nil->prev = nil;
}

void printList(){
	NodePointer cur = nil->next;
	int isf = 1;
	while(1){
		if ( cur == nil ) break;
		if ( isf == 0)	printf(" ");
		printf("%d", cur->key);
		cur = cur->next;
		isf = 0;
	}
	printf("\n");
}

void deleteNode(NodePointer t){
	if (t == nil) return;
	t->prev->next = t->next;
	t->next->prev = t->prev;
	free(t);
}

void deleteFirst(){
	NodePointer t = nil->next;
	if ( t == nil ) return;
	deleteNode(t);
}

void deleteLast(){
	NodePointer t = nil->prev;
	if ( t == nil ) return;
	deleteNode(t);
}

void delete(int key){
	NodePointer t = listSearch(key);
	deleteNode(t);
}


void insert(int key){
	NodePointer x;
	x = malloc(sizeof(struct node));
	x->key = key;
	x->next = nil->next;
	x->prev = nil;
	if (nil->prev == nil) {
		nil->prev = x;
	}

	nil->next->prev = x;
	nil->next = x;
}

int main(){
	int key, n, i;
	int size = 0;
	char com[20];
	int np = 0, nd = 0;
	scanf("%d", &n);
	init();
	for ( i = 0; i < n; i++ ){
		scanf("%s%d", com, &key);
		if ( com[0] == 'i' ) {insert(key); np++; size++;}
		else if ( com[0] == 'd' ) {
			if (strlen(com) > 6){
				if ( com[6] == 'F' ) deleteFirst();
				else if ( com[6] == 'L' ) deleteLast();
			} else {
				delete(key); nd++; 
			}
			size--;
		}
	}
	printList();
	return 0;
}

