#include <iostream>
#include <algorithm>
using namespace std;
short f[2001];
int main(){
    int n,a,b,c,d,c2,i;
    cin>>n>>a>>b>>c>>d;
    //impossible cases:(((((((
    if(abs(a-c)%2==1){
        cout<<"Impossible";
        return 0;
    }
    if(abs(b+abs(a-c)/2)%2==1 && d%2==0){
        cout<<"Impossible";
        return 0;
    }
    if(abs(b+abs(a-c)/2)%2==0 && d%2==1){
        cout<<"Impossible";
        return 0;
    }
    //possible cases 8)
    if(abs(a-c)/2>abs(d-b)){
        int nn=abs(a-c)/2-abs(d-b);
        cout<<abs(a-c)/2<<"\n";
        if(a>c){
            if(d>b){
                for(i=1; i<=nn/2; ++i)
                    cout<<"UL ";
                for(i=1; i<=abs(b-d)+nn/2; ++i)
                    cout<<"UR ";
            }
            else{
                for(i=1; i<=abs(b-d)+nn/2; ++i)
                    cout<<"UL ";
                for(i=1; i<=nn/2; ++i)
                    cout<<"UR ";
            }
        }
        else{
            if(d<b){
                for(i=1; i<=nn/2; ++i)
                    cout<<"LR ";
                for(i=1; i<=abs(b-d)+nn/2; ++i)
                    cout<<"LL ";
            }
            else{
                for(i=1; i<=abs(b-d)+nn/2; ++i)
                    cout<<"LR ";
                for(i=1; i<=nn/2; ++i)
                    cout<<"LL ";
            }
        }
        return 0;
    }
    c2=b;
    for(i=1; i<=abs(c-a)/2; ++i){
            if(c2==d){
                if(a>c)
                    --c2, f[i]=1;
                else
                    ++c2, f[i]=2;
            }
            else if(c2>d)
                --c2, f[i]=1;
            else
                ++c2, f[i]=2;
        

    }
    cout<<abs(c-a)/2 + abs(d-c2)/2<<"\n";
    bool aa=0;
    if(a>c)
        for(i=1; i<=abs(c-a)/2; ++i)
            if(f[i]==1)
                cout<<"UL ";
            else
                cout<<"UR ";
    else{
        
        if(d>b){
            for(i=1; i<=abs(d-c2)/2; ++i)
                cout<<"R ";
            aa=1;
        }
        for(i=1; i<=abs(c-a)/2; ++i)
            if(f[i]==1)
                cout<<"LL ";
            else
                cout<<"LR ";
    }
    for(i=1; i<=abs(d-c2)/2 && aa==0 ; ++i)
        if(d<c2)
            cout<<"L ";
        else
            cout<<"R ";
    return 0;
}