#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

int main()
{
  int n;
  string s;
  cin >> n >> s;
  int cnt = 0;
  for (int i = 0; i + 1 < n; ++i) cnt += (s[i] != s[i + 1]);
  string ans(n, 'L');
  for (auto c : {'L', 'R'})
  {
    ans[0] = c;
    for (int i = 1; i < n; ++i)
    {
      if (s[i - 1] == s[i]) ans[i] = (ans[i - 1] == 'L' ? 'R' : 'L');
      else ans[i] = (ans[i - 1] == 'R' ? 'R' : 'L');
    }
    int sum = 1;
    for (int i = 1; i < n; ++i) sum += ans[i] == 'L';
    int flag = sum % 2 ^ (s[0] == 'o');
    if (flag)
    {
      cout << "Yes" << endl;
      cout << ans << endl;
      return 0;
    }
  }
  cout << "No" << endl;
}