#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, q;
  char c;
  vector<int> a(10);
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> c;
    if (c == 'L') {
      q = 0;
      while (a[q] == 1) {
        q++;
      }
      a[q] = 1;
    } else if (c == 'R') {
      q = 9;
      while (a[q] == 1) {
        q--;
      }
      a[q] = 1;
    } else {
      q = (int)c - 48;
      a[q] = 0;
    }
  }
  for (int i = 0; i < 10; i++) {
    cout << a[i];
  }
  return 0;
}
