#include <bits/stdc++.h>
using namespace std;
int main()
{
	int n,m;
	cin>>n>>m;
	int a[n],b[m];
	for (int i=0;i<n;i++)
		cin>>a[i];
	for (int i=0;i<m;i++)
		cin>>b[i];
	for (int mid=0;mid<=8;mid++)
	{
		string s;
		int id=0;
		for (int i=0;i<n;i++)
		{
			if (id<m && b[id]<a[i])
			{
				s+='L';
				while (id<m && b[id]>=a[i]-mid && b[id]<=a[i])
					id++;
			}
			else
			{
				s+='R';
				while (id<m && b[id]<=a[i]+mid)
					id++;
			}
		}
		if (id==m)
		{
			cout<<mid<<endl;
			cout<<s<<endl;
			return 0;
		}
	}
	
	return 0;
}
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