#include<stdio.h>
int main()
{
	int n;
	scanf("%d", &n);
	int i;
	int t;
	char c;
	char ans[500005];
	int l, r;
	l = r = 200005;
	scanf("%d %c", &t, &c);
	ans[r] = c;
	r++;
	l--;
	for (i = 1; i < n; i++)
	{
		scanf("%d %c", &t, &c);
		if (t > 0)
		{
			ans[l] = c;
			l--;
		}
		else
		{
			ans[r] = c;
			r++;
		}
	}
	for (i = l + 1; i < r; i++)
		printf("%c", ans[i]);
	printf("\n");
	return 0;
}