#include <bits/stdc++.h>
using namespace std;

#define ll long long

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);

#ifndef ONLINE_JUDGE
    freopen("seq_in.txt", "r", stdin);
#endif

    int n;
    cin >> n;

    list<int> nums;
    for(int i = 0; i < n; ++i)
    {
        int k;
        cin >> k;

        nums.push_back(k);
    }

    string order;

    int prev;

    if (nums.front() < nums.back())
    {
        prev = nums.front();
        nums.pop_front();
        order = "L";
    }
    else
    {
        prev = nums.back();
        nums.pop_back();
        order = "R";
    }


    for(int i = 0; i < n - 1; ++i)
    {
        if ((nums.front() < nums.back() || prev > nums.back()) && prev < nums.front())
        {
            prev = nums.front();
            nums.pop_front();
            order += "L";
        }
        else if (prev < nums.back())
        {
            prev = nums.back();
            nums.pop_back();
            order += "R";
        }
        else break;
    }

    cout << order.length() << '\n' << order;

    return 0;
}