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


int main() {
    int n;
    cin>>n;
    int x1,y1,x2,y2;
    cin>>x1>>y1>>x2>>y2;
    int count=0;
    string s;int p=0;
    while(x1!=x2||y1!=y2)
    {
        if(x1>x2&&y1>y2)
        {
            x1-=2;
            y1-=1;
            count++;
            s+="UL ";
        }
        else if(x1<x2&&y1<y2)
        {
            x1+=2;
            y1+=1;
            count++;
            s+="LR ";
        }
        else if(x1<x2&&y1>y2)
        {
            x1+=2;
            y1-=1;
            count++;
            s+="LL ";
        }
        else if(x1>x2&&y1<y2)
        {
            x1-=2;
            y1+=1;
            count++;
            s+="UR ";
        }
        else if(y1>y2&&x1==x2)
        {
            count++;
            y1-=2;
            s+="L ";
        }
        else if(y1<y2&&x1==x2)
        {
            count++;
            y1+=2;
            s+="R ";
        }
        else if(y1==y2&&x1!=x2)
        {
            x1+=2;
            y1+=1;
            count++;
            s+="LR ";
        }
        if(x1<0||y2<0||y1<0||x2<0)
        {
            p=1;
            break;
        }
    }
    if(p==1)
        cout<<"Impossible"<<endl;
    else
    cout<<count<<endl<<s<<endl;
    return 0;
}