#include<stdio.h>
#include<math.h>
int main()
{   int n,i,j,I,J,p,q,k,s,u,v,l,t,a;
    scanf("%d",&n);
    scanf("%d %d %d %d",&i,&j,&I,&J);
    p = abs(i - I);
    q = abs(j - J);
    
    if(J < j)
    {  
         if( I < i)
         {  if(p%2!=0)
            { printf("Impossible");
            }
            else
            {  k = p/2;
               s = q - p/2 ;
               printf("%d\n",k+(s/2));
               for(u=1;u<=k;u++)
               {  printf("UL ");
               }
               for(v=1;v<=s/2;v++)
               { printf("L");
               }
            }
         }
         if(I > i)
         { 
              if(p%2!=0)
              { printf("Impossible");
              }
              else
              {  k = p/2;
                s = q - p/2;
                 printf("%d\n",k+(s/2));
                 for(u=1;u<=k;u++)
                 {  printf("LL ");
                 }
                 for(v=1;v<=s/2;v++)
                 { printf("L ");
                 }
              }
         }
         if( i == I)
         {  if (q%2!=0)
             {  printf("Impossible");
             }
             else
             { l = q/2 ;
                printf("%d\n",l);
                for(u=1;u<=l;u++)
                {  printf("L ");
                }
             }
         }
    }
    if(J > j)
    {  
          if( I < i)
         {  if(p%2!=0)
            { printf("Impossible");
            }
            else
            {  k = p/2;
               s = q - p/2 ;
               printf("%d\n",k+(s/2));
               for(u=1;u<=k;u++)
               {  printf("UR ");
               }
               for(v=1;v<=s/2;v++)
               { printf("L ");
               }
            }
         }
         
          if(I > i)
         { 
              if(p%2!=0)
              { printf("Impossible");
              }
              else
              {  k = p/2;
                s = q - p/2;
                 printf("%d\n",k+(s/2));
                 for(u=1;u<=k;u++)
                 {  printf("LR ");
                 }
                 for(v=1;v<=s/2;v++)
                 { printf("R ");
                 }
              }
         }
            
             if( i == I)
         {  if (q%2!=0)
             {  printf("Impossible");
             }
             else
             { l = q/2 ;
                printf("%d\n",l);
                for(u=1;u<=l;u++)
                {  printf("R ");
                }
             }
         }
    }
    
    if( J == j )
    {   
        if(p%4!=0)
        { printf("Impossible");
        }
        else
        {  if(I < i)
           { t = p/4;
             printf("%d\n",2*t);
             for(a=1;a<=t;t++)
             { printf("UL UR ");
             }
           }
           if( I > i)
            { t = p/4;
             printf("%d\n",2*t);
             for(a=1;a<=t;a++)
             { printf("LR LL ");
             }
            }
        }
    }
           return 0;
}