#include <bits/stdc++.h>
using namespace std;
int a[102];
int main() {
  int n, i, l, r, j;
  char name[100009];
  cin >> n;
  scanf("%s", name);
  l = 0;
  r = 9;
  for (i = 0; i < n; i++) {
    if (name[i] == 'L')
      for (j = 0; j < 10; j++)
        if (a[j] == 0) {
          a[j] = 1;
          break;
        }
    if (name[i] == 'R')
      for (j = 9; j >= 0; j--)
        if (a[j] == 0) {
          a[j] = 1;
          break;
        }
    if (name[i] >= '0' && name[i] <= '9') a[name[i] - '0'] = 0;
  }
  for (i = 0; i < 10; i++) printf("%d", a[i]);
  cout << endl;
  return 0;
}
