#include <bits/stdc++.h>
using namespace std;
long long int c=0;
long long int ii,ji,iif,jf;
vector<string>v;
void l()
{
	// cout<<"L"<<" ";
	v.push_back("L");
	ji-=2;
}
void r()
{
	// cout<<"R"<<" ";
    v.push_back("R");
	ji+=2;
}
void ur()
{
	// cout<<"UR"<<" ";
   v.push_back("UR");
    ii-=2;
	ji++;
}
void ul()
{
	//cout<<"UL"<<" ";
    v.push_back("UL");
	ii-=2;
	ji--;
}

void lr()
{
	//cout<<"LR"<<" ";
	v.push_back("LR");
	ii+=2;
	ji++;
}

void ll()
{
	//cout<<"LL"<<" ";
    v.push_back("LL");
	ii+=2;
	ji--;
}
void redknight()
{
	// cout<<"ii="<<ii<<" "<<"iif="<<iif<<" "<<"ji="<<ji<<" "<<"jf="<<jf;
   if((((ii-iif)==1||(ii-iif)==-1)&&((ji-jf)==1||(ji-jf)==-1))||(((ii-iif)==1||(ii-iif)==-1)&&((ji-jf)==0))||(((ji-jf)==1||(ji-jf)==-1)&&((ii-iif)==0)))
   {
   	cout<<"Impossible"<<endl; 
   	exit(0) ;
   }
   if((ii-iif)==0&&(ji-jf)==0)
   {

    
   	return;
   
   }
   if(ii==iif)
   {
     if((ji-jf)<-1)
     	r();
     else
     	if((ji-jf)>1)
     	  l();
   }
   if(iif>ii)
   {
     if((ji-jf)>0)
     {
     	ll();
     }
     else
     	lr();
   }
    if(iif<ii)
    {
      if((ji-jf)<0)
     {
     	ur();
     }
     else
     	ul();

    }
     redknight();	
     c++;
     return;




}
int main() {
    ios::sync_with_stdio(false);
    cin.tie(NULL);
	long long int n ;
	cin>>n;
	cin>>ii>>ji>>iif>>jf;
	redknight();
	
	cout<<c<<endl;
	for(long long int i=0;i<v.size();i++)
	{
		cout<<v[i]<<" ";
	}

    return 0;
}