#include<bits/stdc++.h>
using namespace std;
int main()
{
    int ans=0;
    int n;
    cin>>n;
    int x1,y1,x2,y2;
    cin>>y1>>x1>>y2>>x2;
    int hd=abs(y1-y2);
    int wd=abs(x1-x2);
    if(hd%2!=0)
        cout<<"Impossible"<<endl;
    else
    {
        int p=hd/2;
        if(hd==0)
        {
            if(wd%2!=0)
                cout<<"Impossible"<<endl;
            else
            {
                p=wd/2;
                cout<<p<<endl;
                if(x1<x2)
                for(int i=0;i<p;i++)
                    cout<<"R ";
                else
                for(int i=0;i<p;i++)
                    cout<<"L ";
            }
            exit(0);
        }
        if(wd==0)
        {
            if(p%2!=0)
                cout<<"Impossible"<<endl;
            else
            {
                cout<<p<<endl;
                p=p/2;
                if(y1>y2)
                for(int i=0;i<p;i++)
                {
                    if(x1!=0)
                    cout<<"UL UR ";
                    else
                        cout<<"UR UL ";
                }
                else
                {
                    for(int i=0;i<p;i++)
                    {
                        if(x1==n-1)
                            cout<<"LL LR ";
                        else
                            cout<<"LR LL ";
                    }
                    
                }
            }
            exit(0);
        }
        if(p%2==0)
        {
            if(wd%2!=0)
                cout<<"Impossible"<<endl;
            else
            {
               int noofhorse=hd/2,nooffloor=wd/2;
                nooffloor=(wd-noofhorse)/2;
                cout<<nooffloor+noofhorse<<endl;
                if(x1<x2 and y1>y2)
                {
                    for(int i=0;i<noofhorse;i++)
                        cout<<"UR ";
                    for(int i=0;i<nooffloor;i++)
                        cout<<"R ";
                }
                else if(x1>x2 and y1>y2)
                {
                    for(int i=0;i<noofhorse;i++)
                        cout<<"UL ";
                    for(int i=0;i<nooffloor;i++)
                        cout<<"L ";
                }
                else if(x1<x2 and y1<y2)
                {
                    for(int i=0;i<nooffloor;i++)
                        cout<<"R ";
                    for(int i=0;i<noofhorse;i++)
                        cout<<"LR ";
                }
                else
                {
                    for(int i=0;i<noofhorse;i++)
                        cout<<"LL ";
                    for(int i=0;i<nooffloor;i++)
                        cout<<"L ";
                }
            }
        }
        else
        {
            if(wd%2==0)
                cout<<"Impossible"<<endl;
            else
            {
                int noofhorse=hd/2,nooffloor;
                nooffloor=(wd-noofhorse)/2;
                cout<<nooffloor+noofhorse<<endl;
                if(x1<x2 and y1>y2)
                {
                    for(int i=0;i<noofhorse;i++)
                        cout<<"UR ";
                    for(int i=0;i<nooffloor;i++)
                        cout<<"R ";
                }
                else if(x1>x2 and y1>y2)
                {
                    for(int i=0;i<noofhorse;i++)
                        cout<<"UL ";
                    for(int i=0;i<nooffloor;i++)
                        cout<<"L ";
                }
                else if(x1<x2 and y1<y2)
                {
                    for(int i=0;i<nooffloor;i++)
                        cout<<"R ";
                    for(int i=0;i<noofhorse;i++)
                        cout<<"LR ";
                }
                else if(x1>x2 and y1<y2)
                {
                    for(int i=0;i<noofhorse;i++)
                        cout<<"LL ";
                    for(int i=0;i<nooffloor;i++)
                        cout<<"L ";
                }
            }
        }
    }
    return 0;
}