#include <bits/stdc++.h>
using namespace std;
long long mod = 998244353;
template <class T>
bool ckmin(T& a, const T& b) {
  return b < a ? a = b, 1 : 0;
}
template <class T>
bool ckmax(T& a, const T& b) {
  return a < b ? a = b, 1 : 0;
}
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  long long t;
  t = 1;
  while (t--) {
    long long n;
    cin >> n;
    string ans = "";
    long long arr[n];
    for (int i = 0; i < n; i++) {
      cin >> arr[i];
    }
    long long left[n], right[n];
    memset(left, 0, sizeof(left));
    memset(right, 0, sizeof(right));
    left[n - 1] = 1;
    for (int i = n - 2; i >= 0; i--) {
      if (arr[i] < arr[i + 1]) {
        left[i] = 1 + left[i + 1];
      } else {
        left[i] = 1;
      }
    }
    right[0] = 1;
    for (int i = 1; i < n; i++) {
      if (arr[i] < arr[i - 1]) {
        right[i] = 1 + right[i - 1];
      } else {
        right[i] = 1;
      }
    }
    long long l = 0, r = n - 1, len = 0, last = 0;
    while (l <= r) {
      if (arr[r] > last && arr[l] > last) {
        if (arr[r] < arr[l]) {
          ans += 'R';
          last = arr[r];
          r--;
          len++;
        } else if (arr[l] < arr[r]) {
          ans += 'L';
          last = arr[l];
          l++;
          len++;
        } else if (arr[l] == arr[r]) {
          long long temp1 = left[l];
          long long temp2 = right[r];
          if (temp1 >= temp2) {
            while (l <= r && temp1 > 0) {
              l++;
              ans += 'L';
              len++;
              temp1--;
            }
          } else {
            while (l <= r && temp2 > 0) {
              r--;
              ans += 'R';
              len++;
              temp2--;
            }
          }
          break;
        }
      } else if (arr[r] > last) {
        long long temp = right[r];
        while (l <= r && temp > 0) {
          ans += 'R';
          len++;
          r--;
          temp--;
        }
        break;
      } else if (arr[l] > last) {
        long long temp = left[l];
        while (l <= r && temp > 0) {
          ans += 'L';
          len++;
          l++;
          temp--;
        }
        break;
      } else {
        break;
      }
    }
    cout << len << "\n";
    cout << ans;
  }
}
