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

int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */ 
    int n;
    cin>>n;
    int i_s,j_s,i_e,j_e;
    cin>>i_s>>j_s>>i_e>>j_e;
    string s[1000];
    int x=0;
    int flag=0;
    if(!(i_s%2==0&&i_e%2==0))
        cout<<"Impossible"<<endl;
    else{
        while(!(i_s==i_e&&j_s==j_e)){
            if(flag==1)
                break;
            else if((i_s-i_e>=2)&&(j_s-j_e>=1)&&i_s>=2&&j_s>=1){
              i_s-=2;
              j_s-=1;
              s[x++]="UL";
            }
            else if((i_s-i_e>=2)&&(j_s-j_e==0)&&i_s>=2&&j_s>=1){
                 i_s-=2;
                 j_s-=1;
                 s[x++]="UL";
             }
             else if((i_s-i_e>=2)&&(j_e-j_s>=1)&&i_s>=2&&j_s<n-1){
              i_s-=2;
              j_s+=1;
              s[x++]="UR";
            }
            else if((i_s-i_e>=2)&&(j_s-j_e==0)&&i_s<2&&j_s<=n-2){
                 i_s-=2;
                 j_s+=1;
                 s[x++]="UR";
             }
             
             else if((i_s-i_e==0)&&(j_e-j_s>=2)&&j_s<n-2){
              
              j_s+=2;
              s[x++]="R";
            }
            else if((i_e-i_s>=2)&&(j_e-j_s>=1)&&i_s<n-2&&j_s<n-1){
              i_s+=2;
              j_s+=1;
              s[x++]="LR";
            }
            else if((i_e-i_s>=2)&&(j_s-j_e==0)&&i_s<2&&j_s<=n-2){
                i_s+=2;
                j_s+=1;
                s[x++]="LR";
            }
             else if((i_e-i_s>=2)&&(j_s-j_e>=1)&&i_s<n-2&&j_s>=1){
              i_s+=2;
              j_s-=1;
              s[x++]="LL";
            }

             else if((i_e-i_s>=2)&&(j_s-j_e==0)&&i_s<=n-3&&j_s>=1){
                 i_s+=2;
                 j_s-=1;
                 s[x++]="LL";
             }
            else if((i_s-i_e==0)&&(j_s-j_e>=2)&&j_s>=2){
              j_s-=2;
              s[x++]="L";
            }
            
            else flag=1;
            //    cout<<"here"<<endl;}
            //cout<<i_s<<" "<<j_s<<" "<<s[x-1]<<endl;
            //if(i_s==i_e&&j_s==j_e)
              //  cout<<"Yes"<<endl;
        }
        if(flag==1)
            cout<<"Impossible"<<endl;
        else{
            cout<<x<<endl;
            for(int i=0;i<x;i++)
                cout<<s[i]<<" ";
            cout<<endl;
        }
    }
    return 0;
}