#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 ir,ic,fr,fc;
    cin>>ir>>ic>>fr>>fc;
    int h=fc-ic,v=ir-fr;
    if(h==0){
        if(abs(v)%4==0){
            cout<<abs(v)/2<<endl;
            if(v>0){
                for(int i=0;i<v/4;i++)
                    cout<<"UL UR";
            }
            else{
                for(int i=0;i<abs(v)/4;i++)
                    cout<<"LR LL";
            }
            cout<<endl;
            }
        else cout<<"Impossible\n";
        }
    else if(v==0){
        if(abs(h)%2==0){
            cout<<abs(h)/2<<endl;
            if(h>0){
                for(int i=0;i<h/2;i++)
                    cout<<"R ";
            }
            else{
                for(int i=0;i<abs(h)/2;i++)
                    cout<<"L ";
            }
            cout<<endl;
            }
        else cout<<"Impossible\n";
        }
    else if(v>0&&h<0){
        if(v%2==0){
            if((-v/2-h)>=0&&(-v/2-h)%2==0){
                cout<<v/2+(-v/2-h)/2<<endl;
                for(int i=0;i<v/2;i++) cout<<"UL ";
                for(int i=0;i<(-v/2-h)/2;i++) cout<<"L ";
                cout<<endl;
            }
             else cout<<"Impossible\n";   
        }
        else cout<<"Impossible\n";
    }
    else if(v>0&&h>0){
        if(v%2==0){
            if(-(v/2-h)>=0&&-(v/2-h)%2==0){
                cout<<v/2-(v/2-h)/2<<endl;
                for(int i=0;i<v/2;i++) cout<<"UR ";
                for(int i=0;i<-(v/2-h)/2;i++) cout<<"R ";
                cout<<endl;
            }
             else cout<<"Impossible\n";   
        }
        else cout<<"Impossible\n";
    }
    else if(v<0&&h>0){
        if(abs(v)%2==0){
            if(-(abs(v)/2-h)>=0&&-(abs(v)/2-h)%2==0){
                cout<<-v/2-(-v/2-h)/2<<endl;
                for(int i=0;i<-v/2;i++) cout<<"LR ";
                for(int i=0;i<-(-v/2-h)/2;i++) cout<<"R ";
                cout<<endl;
            }
             else cout<<"Impossible\n";   
        }
        else cout<<"Impossible\n";
    }
    else if(v<0&&h<0){
        if(-v%2==0){
            if(-(-v/2+h)>=0&&-(-v/2+h)%2==0){
                cout<<-v/2-(-v/2+h)/2<<endl;
                for(int i=0;i<-v/2;i++) cout<<"UL ";
                for(int i=0;i<-(-v/2+h)/2;i++) cout<<"L ";
                cout<<endl;
            }
             else cout<<"Impossible\n";   
        }
        else cout<<"Impossible\n";
    }
    return 0;
}