#include<stdio.h>
#include<stdlib.h>
#include<string.h>
typedef struct Node{
  int key;
  struct Node *next;
  struct Node *prev;
}Node;

Node *nil;

Node* listSearch(int key){
  Node *cur = nil->next;
  while(cur != nil && cur->key != key){
    cur = cur->next;
  }
  return cur;
}

void init(){
  nil = (Node *)malloc(sizeof(Node));
  nil->next = nil;
  nil->prev = nil;
}

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

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

void deleteFirst(){
  deleteNode(nil->next);
}

void deleteLast(){
  deleteNode(nil->prev);
}

void deleteKey(int key){
  deleteNode(listSearch(key));
}

void insert(int key){
  Node *x = (Node *)malloc(sizeof(Node));
  x->key = key;
  x->next = nil->next;
  nil->next->prev = x;
  nil->next = x;
  x->prev = nil;
}

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{
	deleteKey(key);
	nd++;
      }
      size--;
    } 
  }
  printList();
  return 0;
}

