#include<fstream>
#include<cstdio>
#include<memory.h>
#include<deque>
#include<iterator>
using namespace std;
deque<int>c;
int i,j,k,n,m,p;
char x,y,xx;
int main()
{
	freopen("cline.in","r",stdin);
	freopen("cline.out","w",stdout);
	scanf("%d\n",&n);
	p=0;
	for (i=1;i<=n;i++)
	{
		scanf("%c\n",&x);
		if (x=='A')
		{
			scanf("%c",&y);
			scanf("%c",&xx);
			while (xx==' ')
			{
				scanf("%c",&xx);
			}
				if (xx!='\n')
				{
					while (xx!='\n')
					{
						scanf("%c",&xx);
					}
					continue;
				}
			p++;
			if (y=='L')
			{
				c.push_front(p);
			}
			if (y=='R')
			{
				c.push_back(p);
			}
		}
		else
		{
			if (x=='D')
			{
				scanf("%c%d",&y,&k);
				scanf("%c",&xx);
			while (xx==' ')
			{
				scanf("%c",&xx);
			}
				if (xx!='\n')
				{
					while (xx!='\n')
					{
					scanf("%c",&xx);
					}
					continue;
				}
				if (y=='L')
				{
					for (j=1;j<=k;j++);
						c.pop_front();
				}
				if (y=='R')
				{
					for (j=1;j<=k;j++)
						c.pop_back();
				}
			}
		}
	}
	deque<int>::iterator iter;
	for (iter=c.begin();iter!=c.end();iter++)
	{
		printf("%d\n",*iter);
	}
	return 0;
}