#include <bits/stdc++.h>
#pragma GCC optimize("O3")
using namespace std;
template <class T>
T abs(T x) {
  return x > 0 ? x : -x;
}
template <class T>
T sqr(T x) {
  return x * x;
}
template <class T>
T gcd(T a, T b) {
  return a ? gcd(b % a, a) : b;
}
template <class T>
int sgn(T x) {
  return x > 0 ? 1 : (x < 0 ? -1 : 0);
}
const double pi = acos(-1.);
const int N = 3e5 + 20;
const int inf = 1e9 + 7;
int n, m;
int a[N];
int main() {
  ios::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  cin >> n;
  for (int i = 0; i < n; i++) {
    cin >> a[i];
  }
  string s = "";
  int l = 0;
  int r = n - 1;
  int last = -inf;
  while (l < r) {
    if (a[l] > last && a[r] > last) {
      if (a[l] < a[r]) {
        s += "L";
        last = a[l++];
        continue;
      }
      if (a[l] > a[r]) {
        s += "R";
        last = a[r--];
        continue;
      }
      if (a[l + 1] < a[r - 1]) {
        s += "L";
        last = a[l++];
        continue;
      } else {
        s += "R";
        last = a[r--];
        continue;
      }
    } else {
      if (a[l] > last) {
        last = a[l++];
        s += 'L';
        continue;
      }
      if (a[r] > last) {
        last = a[r--];
        s += 'R';
        continue;
      }
      break;
    }
  }
  if (a[l] > last) s += 'L';
  cout << ((int)s.size()) << endl;
  cout << s;
}
