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


int main() {
    int n;
    cin>>n;
    int w,x,y,z;
    cin>>w>>x>>y>>z;
    int p=abs(w-y)/2;
    if((abs(w-y))%2!=0)
        cout<<"Impossible\n";
    else
    {
        int u=(abs(w-y))/2;
        if(u%2!=((abs(x-z))%2))
            cout<<"Impossible\n";
        else
        {
            if(p<abs(x-z))
                p=p+((abs(x-z))-p)/2;
            cout<<p<<endl;
            while(w!=y)
            {
                if(w>y){
                    w=w-2;
                    if(x>z)
                    {
                        x=x-1;
                        cout<<"UL ";
                    }
                    else
                    {
                        x=x+1;
                        cout<<"UR ";
                    }
                }
                else{
                    w=w+2;
                    if(x>z)
                    {
                        x=x-1;
                        cout<<"LL ";
                    }
                    else
                    {
                        x=x+1;
                        cout<<"LR ";
                    }
                }
                    
            }
            if(x>z)
            {
                while(x!=z)
                {
                    cout<<"L ";
                    x=x-2;
                }
            }
            else
                {
                while(x!=z)
                {
                    cout<<"R ";
                    x=x+2;
                }
            }
        }
    }
    return 0;
}