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


int main() {
    int n;
    cin>>n;
    int u1,u2,v1,v2;
    cin>>u1>>u2>>v1>>v2;
    int x=v1-u1;
    int y=v2-u2;
    if(((u1<0 && u1>=n) || (u2<0 && u2>=n) || (v1<0 && v1>=n) ||(v2<0 && v2>=n)) || (x%2 != 0) || ((abs(y)-(abs(x)/2))%2 !=0) )
    {
        cout<<"Impossible"<<endl;
    }
    else 
    {
        int h=abs(x/2);
        int k=abs(y);
        if(k<(h/2))
            cout<<h<<endl;
        else
        {
            k-=h;
            cout<<h+k/2<<endl;
        }
        while(x!=0 || y!=0)
        {
            if(x<=-2 && y<=0)
            {
                x-=(-2);
                y-=-1;
                cout<<"UL ";
            }
            else if(x<=-2 && y>=0)
            {
                x-=(-2);
                y-=1;
                cout<<"UR ";
            }
            else if(y>=2)
            {
                y-=2;
                cout<<"R ";
            }
            else if(x>=2 && y>=0)
            {
                x-=2;
                y-=1;
                cout<<"LR ";
            }
            else if(x>=2 && y<=0)
            {
                x-=2;
                y-=-1;
                cout<<"LL ";
            }
            else if(y<=-2)
            {
                y-=-2;
                cout<<"L ";
            }
        }
    }
    return 0;
}