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

struct Node{
  int key;
  Node *next, *prev;
};

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;
  }
  printf("\n");
}

void deleteNode(Node *t){
  if(t == nil) retun;
  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();
}

