#include<bits/stdc++.h>
using namespace std;
vector<int>v;
int min(int x1,int y1 ,int x2,int y2)
{
	int flag=0;
     while(1)
	{
	int dis;

        dis=abs(x1-x2)*abs(x1-x2)+abs(y1-y2)*abs(y1-y2);
        //cout<<"x1="<<x1<<" "<<"y1="<<y1<<endl;
        	//cout<<dis<<endl;
        if(dis==1||dis==2||dis==8)
        {  //cout<<"here1"<<endl;
        	flag=1;
        	break;
		}
        else if((x1==x2-2&&y1==y2)||(x1==x2+2&&y1==y2))
        {  //cout<<"here2";
        	flag=1;
        	break;
		}
       else if(dis==0)
           break;
      else
      {
         if((y1==y2&&x2<x1)||(x2<x1&&y2<y1))
         {
         	//cout<<"1";
             v.push_back(1);
             x1=x1-2;
             y1=y1-1;
             //return min(x1-2,y1-1,x2,y2);
         }
          else if(x2<x1&&y2>y1)
          {
          	//cout<<"2";
              v.push_back(2);
              x1=x1-2;
              y1=y1+1;
              //return min(x1-2,y1+1,x2,y2);
              
          }
          else if(x1==x2&&y2>y1)
          {
          	//cout<<"3";
              v.push_back(3);
              y1=y1+2;
              //return min(x1,y1+2,x2,y2);
          }
          else if(y1==y2&&x2>x1||y2>y1&&x2>x1)
          {
          //	cout<<"6";
              v.push_back(4);
              x1=x1+2;
              y1=y1+1;
              //return min(x1+2,y1+1,x2,y2);
          }
          else if(x2>x1&&y2<y1)
          {
          //	cout<<"5";
              v.push_back(5);
              x1=x1+2;
              y1=y1-1;
             // return min(x1+2,y1-1,x2,y2);
          }
          else if(x1==x2&&y2<y1)
          {
          //	cout<<"6";
              v.push_back(6);
              y1=y1-2;
             // return min(x1,y1-2,x2,y2);
          }
     	
	}
        }
        
        return flag;
}
int main()
{
   int f,n,x1,y1,x2,y2;
       cin>>n;
    cin>>x1>>y1>>x2>>y2;
    
    f=min(x1,y1,x2,y2);
    //cout<<"flag="<<f<<endl;
    if(f==1)
    cout<<"Impossible";
    else
    {
    	cout<<v.size()<<endl;
    	int l=v.size();
    	sort(v.begin(),v.end());
 for(int i=0;i<v.size();i++)
       if(v[i]==1)
       cout<<"UL"<<" ";
       else if(v[i]==2)
       cout<<"UR"<<" ";
       else if(v[i]==3)
       cout<<"R"<<" ";
       else if(v[i]==4)
       cout<<"LR"<<" ";
       else if(v[i]==5)
       cout<<"LL"<<" ";
       else if(v[i]==6)
       cout<<"L"<<" ";
	}
   
 
}