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


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin>>n;
    int xs,ys,xe,ye;
    cin>>xs>>ys>>xe>>ye;
    if(abs(xs-xe)%2==1)
    {
        cout<<"Impossible";
    }
    else if(xs==xe&&abs(ye-ys)%2==1)
    {
        cout<<"Impossible";
    }
    else if(xe<xs&&ye<ys&&(ys-abs(xs-xe)/2-ye)%2==0)
    {
        cout<<abs(xs-xe)/2+(ys-abs(xs-xe)/2-ye)/2<<"\n";
        for(int i=0;i<abs(xs-xe)/2;i++)
            cout<<"UL ";
        for(int i=0;i<(ys-abs(xs-xe)/2-ye)/2;i++)
            cout<<"L ";
    }
    else if(xe<xs&&ye>ys&&(ye-abs(xs-xe)/2-ys)%2==0)
    {
        cout<<abs(xs-xe)/2+(ye-abs(xs-xe)/2-ys)/2<<"\n";
        for(int i=0;i<abs(xs-xe)/2;i++)
            cout<<"UR ";
        for(int i=0;i<(ys-abs(xs-xe)/2-ye)/2;i++)
            cout<<"R ";
    }
    else if(xe>xs&&ye<ys&&(ys-abs(xs-xe)/2-ye)%2==0)
    {
        cout<<abs(xs-xe)/2+(ys-abs(xs-xe)/2-ye)/2<<"\n";
        for(int i=0;i<abs(xs-xe)/2;i++)
            cout<<"LL ";
        for(int i=0;i<(ys-abs(xs-xe)/2-ye)/2;i++)
            cout<<"L ";
    }
    else if(xe<xs&&ye>ys&&(ye-abs(xs-xe)/2-ys)%2==0)
    {
        cout<<abs(xs-xe)/2+(ye-abs(xs-xe)/2-ys)/2<<"\n";
        for(int i=0;i<abs(xs-xe)/2;i++)
            cout<<"LR ";
        for(int i=0;i<(ye-abs(xs-xe)/2-ys)/2;i++)
            cout<<"R ";
    }
    else
        cout<<"Impossible";
    return 0;
}