#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
   int n,a,b,c,d,i=0;
    cin>>n;
    cin>>a>>b>>c>>d;
    int count=0;
    string str;
    bool flag=1;
    if(abs(a-c)%2!=0)
           cout<<"Impossible";
    else {
        
    while(1)
    {   
        if(b>d) // Move left
            {
                if(a>c)
                {        //UL
                       a=a-2;
                        b=b-1;
                       count++;
                    str+="UL ";
                    
                }
            else if(a<c)
            {
                   //LL
                 a=a+2;
                        b=b-1;
                   count++;
                   str+="LL ";
                
            }
        else
        {
               if((b-d)%2==0)
               {     
                        // loop and move and print and break
                   
                   while(b!=d)
                   {   str+="L ";   b-=2;  count++;    }
                       
                       break;
               }
            else 
            {       flag=0;
                  cout<<"Impossible";
                   break;
            }
            
        }
        
        
            }
        else if(b<d)   // Move right 
        {
            
            if(a>c)
                {       
                //UR
                        a=a-2;
                        b=b+1;
                    count ++;
                    str+="UR ";
                    
                    
                }
            else if(a<c)
            {
                   //LR
                // know that r is more prioritize over lr
                    if((b+(c-a)/2==d))
                    { a=a+2;
                       b=b+1;
                 count++;
                    str+="LR ";  }
                else 
                {
                     str+="R ";   b+=2;  count++; 
                }
            }
        else
        {
               if((b-d)%2==0)
               {     
                   // loop and move and print and break
                        while(b!=d)
                   {   str+="R ";   b+=2;  count++;    }
                            
                           
                           break;
               }
            else 
            {    flag=0;
                 cout<<"Impossible";
                   break;
            }
            
            
            
            
        }
            
        }
        
        else
        {
            if(a==c)
                break;
            else if((abs(a-c))%4==0)
            {
                   if(a>c)
                   {
                        while(a!=c)
                        {
                            a-=4;
                            count+=2;
                            str+="UL UR ";
                        }
                       
                       break;
                       
                   }
                else
                {
                      while(a!=c)
                        {
                            a+=4;
                            count+=2;
                            str+="LR LL  ";
                        }
                       
                       break;
                    
                    
                    
                }
                
                
            }
            else
            {
                flag=0;
                 cout<<"Impossible";
                   break;
                
                
            }
                
        }
        
        
    }
        
        if(flag==1)
        {
            cout<<count<<endl;
             cout<<str;
            
        }
        
    }
    return 0;
}