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


int main() {
    int grid,i,ix,iy,fx,fy,dx,dy,l,r;
    cin>>grid;
    cin>>iy>>ix>>fy>>fx;
    if((iy-fy)%2==1)
    {
        cout<<"Impossible\n";
        return 0;
    }
    else if((((iy-fy)%4)==0)&&(((ix-fx)%2)==1))
    {
            cout<<"Impossible\n";
            return 0;
    }
    else if((((iy-fy)%4)==2)&&(((ix-fx)%2)==0))
    {
        cout<<"Impossible\n";
        return 0;
    }
    else
    {    dx=abs(ix-fx);
            dy=abs(iy-fy);
            if(dy<=2*dx)
            {
                cout<<((dy/2)+(dx-(dy/2))/2)<<"\n";
                if(fx<ix)
                {
                    if(fy<iy)
                    {
                        for(i=1;i<=(dy/2);i++)
                            cout<<"UL ";
                        for(i=1;i<=((dx-(dy/2))/2);i++)
                            cout<<"L ";
                        return 0;
                    }
                    else
                    {
                        for(i=1;i<=(dy/2);i++)
                            cout<<"LL ";
                        for(i=1;i<=((dx-(dy/2))/2);i++)
                            cout<<"L ";
                        return 0;
                    }
                }
                else
                {
                    if(fy<iy)
                    {
                        for(i=1;i<=(dy/2);i++)
                            cout<<"UR ";
                        for(i=1;i<=((dx-(dy/2))/2);i++)
                            cout<<"R ";
                        return 0;
                    }
                    else
                    {
                        for(i=1;i<=((dx-(dy/2))/2);i++)
                            cout<<"R ";
                        for(i=1;i<=(dy/2);i++)
                            cout<<"LR ";
                        return 0;
                    }
                }
            }
            else
            {
                cout<<dy/2<<"\n";
                if(fy<iy)
                {
                    if(fx<ix)
                    {
                        l=(dx+(dy/2))/2;
                        r=((dy/2)-dx)/2;
                    }
                    else
                    {
                        r=(dx+(dy/2))/2;
                        l=((dy/2)-dx)/2;
                    }
                    if(l<=ix)
                    {
                        for(i=1;i<=l;i++)
                            cout<<"UL ";
                        for(i=1;i<=r;i++)
                            cout<<"UR ";
                        return 0;
                    }
                    else
                    {
                        for(i=1;i<=ix;i++)
                            cout<<"UL ";
                        for(i=1;i<=(l-ix);i++)
                            cout<<"UR UL ";
                        for(i=1;i<=(r+ix-l);i++)
                            cout<<"UR ";
                        return 0;
                    }
                }
                else
                {
                  if(fx<ix)
                    {
                        l=(dx+(dy/2))/2;
                        r=((dy/2)-dx)/2;
                    }
                    else
                    {
                        r=(dx+(dy/2))/2;
                        l=((dy/2)-dx)/2;
                    }
                    if(r<=(grid-ix))
                    {
                        for(i=1;i<=r;i++)
                            cout<<"LR ";
                        for(i=1;i<=l;i++)
                            cout<<"LL ";
                        return 0;
                    }
                    else
                    {
                        for(i=1;i<=(grid-ix);i++)
                            cout<<"LR ";
                        for(i=1;i<=(r+ix-grid);i++)
                            cout<<"LL LR ";
                        for(i=1;i<=(l+grid-r-ix);i++)
                            cout<<"LL ";
                        return 0;
                    }  
                }
            }
    }   
}