#include <math.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <assert.h>
#include <limits.h>
#include <stdbool.h>


int main() {
    int n; 
    scanf("%i", &n);
    int i_start; 
    int j_start; 
    int i_end; 
    int j_end; 
    scanf("%i %i %i %i", &i_start, &j_start, &i_end, &j_end);
    
    int i,r,s,p,q;
    
    r=i_start - i_end;
    s=j_start - j_end;
    
   if(r%2==0)
   {
      
     if(r>0 && s>0) 
     { 
          p=r/2;
       if(s!=p){p=p+1;}
         printf("%d\n",p);
        while(r!=0)
        {
           r=r-2;
            s=s-1;
           
            printf("UL ");
        }
       if(s!=0){ printf("L");}  
     }
       else if(r<0 && s>0)
       {
           r=-r;
                p=r/2;
       if(s!=p){p=p+1;}
         printf("%d\n",p);
        while(r!=0)
        {
           r=r-2;
            s=s-1;
           
            printf("UR ");
        }
       if(s!=0){ printf("R");}
       }
       
       else if(r<0 && s<0)
       {
             r=-r;
                p=r/2;
       if(s!=p){p=p+1;}
         printf("%d\n",p);
           int x=0;
        while(r!=0)
        {
           r=r-2;
            s=s+1;
           x++;
            
        }
       if(s!=0){ printf("R");}
           
           for(i=0;i<x;i++)
           {printf("LR ");}
       }
       
       
       else if(r>0 && s<0)
       {
           p=r/2;
       if(s!=p){p=p+1;}
         printf("%d\n",p);
        while(r!=0)
        {
           r=r-2;
            s=s+1;
           
            printf("LL ");
        }
       if(s!=0){ printf("L");} 
       }
       
       else if(r<0 && s==0)
       {
           r=-r;
           p=(r/2);
           printf("%d\n",p);
          
           int y=p/2;
           for(i=0;i<y;i++)
               printf("LR ");
           for(i=0;i<y;i++)
               printf("LL ");
       }
       
         else if(r>0 && s==0)
       {
          
           p=(r/2);
           printf("%d\n",p);
          
           int y=p/2;
           for(i=0;i<y;i++)
               printf("UL ");
           for(i=0;i<y;i++)
               printf("UR ");
       }
       
       else if(r==0 && s>0)
       {
           if(s%2!=0){printf("Impossible");}
           else
           {
               q=s/2;
               printf("%d",q);
               for(i=0;i<q;i++)
               {
                   printf("R ");
               }
           }
       }
       
         
       else if(r==0 && s<0)
       { s=-s;
           if(s%2!=0){printf("Impossible");}
           else
           {
               q=s/2;
               printf("%d",q);
               for(i=0;i<q;i++)
               {
                   printf("L ");
               }
           }
       }
   }
    else
    {
        printf("Impossible");
    }
    return 0;
}