#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 i1,j1,i2,j2,sh;
    scanf("%d%d%d%d",&i1,&j1,&i2,&j2);
    if ((i1-i2)%2==0)
    {
        int c,d,e,min;
        c=(abs(i1-i2))/2;
        d=abs(j1-j2);
        e=abs((d-c));
        if(e%2==1)
            printf("Impossible\n");
        else
        {
            min=c+(e/2);
            printf("%d\n",min);
            if(i1>i2)
            {
               if(j1>j2)
               {
                   while(i1>i2)
                   {
                       printf("UL ");
                       i2=i2+2;
                       j2=j2+1;
                   }
                   while(j1>j2)
                   {
                       printf("L ");
                       j2=j2+2;
                   }
                   while(j2>j1)
                   {
                       printf("R ");
                       j1=j1+2;
                   }
               }
                else 
                {
                   while(i1>i2)
                   {
                       printf("UR ");
                       i2=i2+2;
                       j1=j1+1;
                   }
                   while(j2>j1)
                   {
                       printf("R ");
                       j1=j1+2;
                   }
                   while(j1>j2)
                   {
                       printf("L ");
                       j2=j2+2;
                   }
                }
            }
            else
            {
                if(j1>j2)
               {
                   while(i2>i1)
                   {
                       printf("LL ");
                       i1=i1+2;
                       j2=j2+1;
                   }
                   while(j1>j2)
                   {
                       printf("L ");
                       j2=j2+2;
                   }
                   while(j2>j1)
                   {
                       printf("R ");
                       j1=j1+2;
                   }
               }
                else 
                {
                   while(i2>i1)
                   {
                       printf("LR ");
                       i1=i1+2;
                       j1=j1+1;
                   }
                   while(j2>j1)
                   {
                       printf("R ");
                       j1=j1+2;
                   }
                   while(j1>j2)
                   {
                       printf("L ");
                       j2=j2+2;
                   }
                }
            }
            
            }
        }
    else
    {
        printf("Impossible\n");
    }
    return 0;
}