#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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