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

int ul=0,ur=0,r=0,lr=0,ll=0,l=0;

void fg( int* x, int* y) 
{ 
    if(*y==0)
    {
        if(*x>0)
        {
          l+=*x/2;
        }    
        else
        {
          r+=-*x/2;
          *x=0;
        }        
              
    }
    
    else if(*x==0)
    {
      if(*y>0)
      {
          ul+=*y/4;
          ur+=*y/4;
          *y=0;
      }
    
      else
      {
          ll+=-*y/4;
          lr+=-*y/4;
          *y=0;
      }
   }
    
    
    
    
    else
    { 
        if(*x>0)
        { 
             if(*y>0)
          {
            if(*x<*y/2)
            {
               ul+=*x;
                *x=0;
                *y-=ul*2;
            }
             
            else
            { 
                ul+=*y/2;
                *y=0;
                *x-=ul;
              
            }
        }
       
            else
         {
          if(*x<-(*y/2))
            {
               ll+=*x;
                *x=0;
                *y+=ll*2;
            }
             
            else
            {
                ll+= -(*y/2);
                *y=0;
                *x-=ll;
            }               
        }
         
       }
    
        else
      {
            
         if(*y>0)
         {
            if(-*x<*y/2)
            {
               ur+= -*x;
                *x=0;
                *y-=ur*2;
            }
             
            else
            {
                ur+=*y/2;
                *y=0;
                *x+=ur;
            }
        }
       
            else
        {
          if(-*x<-(*y/2))
            {
               lr+=-*x;
                *x=0;
                *y+=lr*2;
            }
             
            else
            {
                lr+= -(*y/2);
                *y=0;
                *x+=lr;
            }               
        }
        
         
      
        }
    
  fg(x,y);
    
    }
 
}


int main() {
    int n;
    cin>>n;
    
   int i1,i2,f1,f2;
    
    cin>> i1>>i2>>f1>>f2;
   int y=i1-f1;
    int x=i2-f2;
    
    if ( (y%4==0 && x%2==0) || ((y%4==2||y%4==-2) && x%2!=0 )) 
        
    {
           fg(&x,&y) ; //cout<<"call";
       cout<<ul+ur+r+lr+ll+l<<"\n";
        while(ul--)
        {cout<<"UL ";}
        while(ur--)
        {cout<<"UR ";}
        while(r--)
        {cout<<"R ";}
        while(lr--)
       {cout<<"LR ";}
        while(ll--)
        {cout<<"LL ";}
        while(l--)
        {cout<<"L ";}
        
        
    }
    
    else
    { 
        cout<<"Impossible";
        
    }
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    return 0;
}