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


int main() {
    int n,sy,sx,ey,ex;
    cin>>n>>sy>>sx>>ey>>ex;
    if((sy-ey)%2) {
        cout<<"Impossible"<<endl;
        return 0;
    }
    if(((sx+(sy-ey)/2)-ex)%2) {
        cout<<"Impossible"<<endl;
        return 0;
    }
    string out="";
    int count=0;
    while(sx!=ex || sy!=ey) {
        count++;
        if(sy>ey) {
            if((ex-sx+1)<=((sy-2-ey)/2) && sx>0) {
                out+="UL ";
                sx--;
                sy-=2;
            }
            else {
                out+="UR ";
                sx++;
                sy-=2;
            }
        } else if((ex-sx)>((ey-sy)/2)) {
            out+="R ";
            sx+=2;
        }
        else if((sx+1-ex)<=((ey-sy-2)/2) && sx<(n-1)) {
            out+="LR ";
            sx++;
            sy+=2;
        }
        else if(sy<ey) {
            out+="LL ";
            sx--;
            sy+=2;
        }
        else {
            out+="L ";
            sx-=2;
        }
    }
    cout<<count<<endl;
    cout<<out;
    return 0;
}