include[HTML_REMOVED]
using namespace std;
const int N = 100010;
int head,e[N],ne[N],idx;
void init()
{
head = -1;
idx = 0;
}
void add_to_head(int x)
{
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]];
}
int main()
{
int m;
cin>>m;
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;
}