#include <iostream>

using namespace std;

const int N = 100010;

//head表示头结点下标;e[i]表示节点i的值;ne[i]表示节点i的next指针是多少;idx存储当前已经用到了哪个点
int head, e[N], ne[N], idx;

void init()                 //初始化
{
    head = -1;
    idx = 0;
}

void add_to_head(int x)     //将x插入到头结点
{
    e[idx] = x, ne[idx] = head, head = idx ++ ;         
}

void add(int k, int x) 
{
    e[idx] = x, ne[idx] = ne[k], ne[k] = idx ++ ;
}

void remove(int k) 
{
    ne[k] = ne[ne[k]];      //跳过下一个节点，直接指向下下个节点
}

int main() 
{
    int m;
    cin >> m;               //输入操作次数

    init();

    while (m -- ) 
    {
        int k, x;
        char op;

        cin >> op;
        if (op == 'H') 
        {
            cin >> x;
            add_to_head(x);
        } 
        else if (op == 'D') 
        {
            cin >> k;
            if (!k) head = ne[head];
            remove(k - 1);
        } 
        else 
        {
            cin >> k >> x;
            add(k - 1, x);
        }
    }

    for (int i = head; i != -1; i = ne[i]) cout << e[i] << " ";
    cout << endl;

    return 0;
}