#include<bits/stdc++.h>
using namespace std;
//输入保证正确
//输出看仔细
//所有情况都测
//数组定义，保证正确
int n , p1 , p2 , A;
int main()
{
	cin >> n>> p1 >> p2 >> A;
	if(p1%2==A%2)
		cout<<"L";
	else
		cout<<"R";  
 	return 0;
}