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

int main(int argc, char const *argv[])
{
#ifndef ONLINE_JUDGE
	freopen("in.txt", "r", stdin);
#endif
	ios_base::sync_with_stdio(false);
	cin.tie(0);

	deque<int> deq;
	stack<int> st;
	st.push(0);
	string ans;
	int cnt = 0;

	int n, x;
	cin >> n;
	while (n--) {
		cin >> x;
		deq.push_back(x);
	}

	while (!deq.empty()) {
		if (st.top() >= deq.front() && st.top() >= deq.back())
			break;
		++cnt;
		if (deq.front() < deq.back() && deq.front() > st.top()) {
			st.push(deq.front());
			ans += "L";
			deq.pop_front();
		}
		else {
			st.push(deq.back());
			ans += "R";
			deq.pop_back();
		}

	}
	cout << cnt << '\n' << ans << '\n';
	return 0;
}