#include <stdio.h>
#include <string.h>

int main()
{
    int n,cnt=0;
    scanf("%d", &n);
    char str[n][5],k[5],re[n][5];
	strcpy(k,"<bs>");
    for (int i = 0; i < n; i++)
    {
        scanf("%s", str[i]);
    }

    for (int i = 0; i < n; i++)
    {
        if (strcmp(str[i], k) == 0)
        {
        	
        	strcpy(re[cnt-1],"0");
        	cnt--;
            continue;
        }

          strcpy(re[cnt],str[i]);
          
          cnt++;
    }
    for(int i=0;i<cnt;i++)
	{
		printf("%s",re[i]);
	} 

    return 0;
}