#define _CRT_SECURE_NO_WARNINGS
#include "bits/stdc++.h"
//#include "libs.h"
#include <random>
#include <unordered_map>
#include <unordered_set>
//#include <opencv2/core.hpp>
//#include <opencv2/highgui.hpp>
//#include <opencv2/imgproc.hpp>

using namespace std;

//呪文
#define DUMPOUT cerr
#define dump(...) DUMPOUT<<"  ";DUMPOUT<<#__VA_ARGS__<<" :["<<__LINE__<<":"<<__FUNCTION__<<"]"<<endl;DUMPOUT<<"    ";dump_func(__VA_ARGS__)

typedef unsigned uint; typedef long long ll; typedef unsigned long long ull; typedef pair<int, int> pii; typedef pair<ll, ll> pll; typedef pair<double, double> pdd; typedef pair<string, string> pss;
template <typename _KTy, typename _Ty> ostream& operator << (ostream& o, const pair<_KTy, _Ty>& m) { o << "{" << m.first << ", " << m.second << "}"; return o; }
template <typename _KTy, typename _Ty> ostream& operator << (ostream& o, const map<_KTy, _Ty>& m) { if (m.empty()) { o << "{ }"; return o; } o << "{" << *m.begin(); for (auto itr = ++m.begin(); itr != m.end(); itr++) { o << ", " << *itr; } o << "}"; return o; }
template <typename _KTy, typename _Ty> ostream& operator << (ostream& o, const unordered_map<_KTy, _Ty>& m) { if (m.empty()) { o << "{ }"; return o; } o << "{" << *m.begin(); for (auto itr = ++m.begin(); itr != m.end(); itr++) { o << ", " << *itr; } o << "}"; return o; }
template <typename _Ty> ostream& operator << (ostream& o, const vector<_Ty>& v) { if (v.empty()) { o << "{ }"; return o; } o << "{" << v.front(); for (auto itr = ++v.begin(); itr != v.end(); itr++) { o << ", " << *itr; } o << "}"; return o; }
template <typename _Ty> ostream& operator << (ostream& o, const set<_Ty>& s) { if (s.empty()) { o << "{ }"; return o; } o << "{" << *(s.begin()); for (auto itr = ++s.begin(); itr != s.end(); itr++) { o << ", " << *itr; } o << "}"; return o; }
template <typename _Ty> ostream& operator << (ostream& o, const unordered_set<_Ty>& s) { if (s.empty()) { o << "{ }"; return o; } o << "{" << *(s.begin()); for (auto itr = ++s.begin(); itr != s.end(); itr++) { o << ", " << *itr; }	o << "}"; return o; }
template <typename _Ty> ostream& operator << (ostream& o, const stack<_Ty>& s) { if (s.empty()) { o << "{ }"; return o; } stack<_Ty> t(s); o << "{" << t.top(); t.pop(); while (!t.empty()) { o << ", " << t.top(); t.pop(); } o << "}";	return o; }
template <typename _Ty> ostream& operator << (ostream& o, const list<_Ty>& l) { if (l.empty()) { o << "{ }"; return o; } o << "{" << l.front(); for (auto itr = ++l.begin(); itr != l.end(); ++itr) { o << ", " << *itr; } o << "}"; return o; }
template <typename _KTy, typename _Ty> istream& operator >> (istream& is, pair<_KTy, _Ty>& m) { is >> m.first >> m.second; return is; }
template <typename _Ty> istream& operator >> (istream& is, vector<_Ty>& v) { for (size_t i = 0; i < v.size(); i++) is >> v[i]; return is; }
namespace aux { // print tuple
	template<typename Ty, unsigned N, unsigned L> struct tp { static void print(ostream& os, const Ty& v) { os << get<N>(v) << ", "; tp<Ty, N + 1, L>::print(os, v); } };
	template<typename Ty, unsigned N> struct tp<Ty, N, N> { static void print(ostream& os, const Ty& v) { os << get<N>(v); } };
}
template<typename... Tys> ostream& operator<<(ostream& os, const tuple<Tys...>& t) { os << "{"; aux::tp<tuple<Tys...>, 0, sizeof...(Tys)-1>::print(os, t); os << "}"; return os; }

template<typename A, size_t N, typename T> inline void Fill(A(&array)[N], const T &val) { std::fill((T*)array, (T*)(array + N), val); }

void dump_func() { DUMPOUT << endl; }
template <class Head, class... Tail> void dump_func(Head&& head, Tail&&... tail) { DUMPOUT << head; if (sizeof...(Tail) == 0) { DUMPOUT << " "; } else { DUMPOUT << ", "; } dump_func(std::move(tail)...); }

#define PI 3.14159265358979323846
#define EPS 1e-10
#define FOR(is,a,n) for(int is=(a);is<(n);++is)
#define REP(is,n)  FOR(is,0,n)
#define all(j) (j).begin(), (j).end()
#define SZ(j) ((int)(j).size())
#define fake false



template<typename T> void printVec(const vector<T>& v, char delim = ' ', ostream& os = cout) {
	os << v[0];
	for (int i = 1; i < v.size(); i++)
		os << delim << v[i];
	os << endl;
}

template<class T> class CDoublyLinkedList {
	typedef struct SNode {
	public:
		T key;
		SNode* prev;
		SNode* next;
	}* SNodePtr;

	SNodePtr nil;

	SNodePtr listSearch(const T& key) {
		SNodePtr cur = nil->next;
		while (cur != nil && cur->key != key)
			cur = cur->next;
		return cur;
	}
	void deleteNode(SNodePtr cur) {
		if (cur == nil)
			return;
		SNodePtr prev = cur->prev;
		SNodePtr next = cur->next;
		prev->next = next;
		next->prev = prev;
		delete cur;
	}

public:
	CDoublyLinkedList() {
		nil = new SNode;
		nil->prev = nil->next = nil;
	}
	void push_front(T key) {
		SNodePtr cur = new SNode;
		cur->key = key;
		SNodePtr next = nil->next;
		nil->next = cur;
		cur->prev = nil;
		cur->next = next;
		next->prev = cur;
	}
	void pop_front() {
		deleteNode(nil->next);
	}
	void pop_back() {
		deleteNode(nil->prev);
	}
	void erase(T key) {
		SNodePtr cur = listSearch(key);
		if (cur == nil)
			return;
		deleteNode(cur);
	}
	vector<T> getList() {
		vector<T> ret;
		SNodePtr node = nil->next;
		while (node != nil) {
			ret.push_back(node->key);
			node = node->next;
		}
		return ret;
	}
	~CDoublyLinkedList() {
		delete nil;
	}
};

int main() {

	cin.tie(0);
	ios::sync_with_stdio(false);

	//clock_t elapses;
	//elapses = clock();

	CDoublyLinkedList<int> dll;

	int n;
	cin >> n;
	for (int i = 0; i < n; i++) {
		string order;
		int val;
		cin >> order;
		if (order == "insert" || order == "delete")
			cin >> val;

		if (order == "insert")
			dll.push_front(val);
		else if (order == "delete")
			dll.erase(val);
		else if (order == "deleteFirst")
			dll.pop_front();
		else
			dll.pop_back();
	}

	vector<int> ans = dll.getList();
	printVec(ans);
	
	//elapses = clock() - elapses;
	//dump(double(elapses) / CLOCKS_PER_SEC);

	return 0;
}



Measured memory_bytes: 33948