#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;
bool visto[200][200],r=false;
int trace[200],cam[200];
int n,xf,yf,op=4000;
void setup(){
    for(int i=0;i<200;i++){
        for(int j=0;j<200;j++){
            visto[i][j]=false;
        }
    cam[i]=trace[i]=0;
    }
}
void solve(int xi,int yi,int c){
    if(!(xi<0 || xi>=n || yi<0 || yi>=n || c>=op)){
        if(xi==xf && yi==yf){
            op=c;
            for(int i=0;i<op;i++){
                trace[i]=cam[i];
            }
            r=true;
        }else{
            if(!visto[xi][yi]){
            visto[xi][yi]=true;
                cam[c]=1;
                solve(xi-1,yi-2,c+1);//UL
                cam[c]=2;
                solve(xi+1,yi-2,c+1);//UR
                cam[c]=3;
                solve(xi+2,yi,c+1);//R
                cam[c]=4;
                solve(xi+1,yi+2,c+1);//LR
                cam[c]=5;
                solve(xi-1,yi+2,c+1);//LL
                cam[c]=6;
                solve(xi-2,yi,c+1);//L
                visto[xi][yi]=false;
            }
        }
    }
}
void id(int i){
    if(i==1)cout<<"UL";
    if(i==2)cout<<"UR";
    if(i==3)cout<<"R";
    if(i==4)cout<<"LR";
    if(i==5)cout<<"LL";
    if(i==6)cout<<"L";
}
int main() {
    cin>>n;
    int xi,yi;
    setup();  
    cin>>yi>>xi>>yf>>xf;
    if(yi%2!=yf%2){
        cout<<"Impossible\n";
    }else{
    solve(xi,yi,0);
    if(op!=4000){
        cout<<op<<"\n";
        for(int i=0;i<op-1;i++){
            id(trace[i]);
            cout<<" ";
        }
        id(trace[op-1]);
    }else cout<<"Impossible\n";
        }
}