#include <bits/stdc++.h>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
    int n;
    cin>>n;
    int x,y,a,b;
    cin>>x>>y>>a>>b;
    int f=1,c=0;
    string s;
    while(f)
    {
        f=0;
        if(a>x)
        {
            if(b>=y)
            {
                x+=2;
                y++;
                f++;
                s+="LR ";
                c++;
            }
            else
            {
                x+=2;
                y--;
                f++;
                s+="LL ";
                c++;
            }
          
        }
        else if(a<x)
        {
             if(b>=y)
            {
                x-=2;
                y++;
                f++;
                 s+="UR ";
                 c++;
            }
            else
            {
                x-=2;
                y--;
                s+="UL ";
                f++;
                c++;
            }
        }
        else if(a==x)
        {
            if(b>y)
            {
               f++; 
                y+=2;
                c++;
                s+="R ";
            }
            else
            {
                y-=2;
                s+="L ";
                c++;
                f++;
            }
        }
          if(a==x && b==y)
            {
                f=0;
              cout<<c<<endl;
              cout<<s<<endl;
                break;
            }
    }
    if(c==0)
    {
        cout<<"Impossible"<<endl;
    }
        
    return 0;
}